Human Enzyme System: 100 Multiple-Choice Questions for Liberty
University
1. What is an enzyme?
a) A type of carbohydrate
b) A biological catalyst
c) A hormone
d) A type of lipid
Answer: b) A biological catalyst
2. Which of the following is NOT a characteristic of enzymes?
a) They are proteins
b) They lower activation energy
c) They are consumed in reactions
d) They are specific to their substrates
Answer: c) They are consumed in reactions
3. The region of an enzyme where the substrate binds is called:
a) Active site
b) Allosteric site
c) Cofactor site
d) Prosthetic group
Answer: a) Active site
4. Which theory best explains enzyme-substrate interaction?
a) Lock and key model
b) Induced fit model
c) Collision theory
d) Transition state theory
Answer: b) Induced fit model
5. Enzymes function by:
a) Increasing the activation energy of reactions
b) Decreasing the activation energy of reactions
c) Changing the equilibrium of reactions
d) Providing energy for reactions
Answer: b) Decreasing the activation energy of reactions
6. The suffix commonly used to name enzymes is:
a) -ase
b) -ose
c) -in
d) -ol
Answer: a) -ase
7. Which of the following is an example of a hydrolase?
a) Lipase
b) DNA polymerase
c) Pyruvate carboxylase
d) Alcohol dehydrogenase
Answer: a) Lipase
8. Enzyme activity is typically measured in:
a) Moles per second
b) Grams per liter
c) Units of activity
d) Joules per mole
Answer: c) Units of activity
9. Which factor does NOT affect enzyme activity?
a) Temperature
b) pH
c) Substrate concentration
d) Enzyme color
Answer: d) Enzyme color
10. The optimal pH for most human enzymes is around:
a) 2-3
b) 6-8
c) 10-12
d) 13-14
Answer: b) 6-8
11. Competitive inhibitors:
a) Bind to the active site
b) Bind to an allosteric site
c) Permanently deactivate the enzyme
d) Increase enzyme activity
Answer: a) Bind to the active site
12. Non-competitive inhibitors:
a) Compete with the substrate for the active site
b) Bind to a site other than the active site
c) Always increase enzyme activity
d) Only work at high temperatures
Answer: b) Bind to a site other than the active site
13. Coenzymes are:
a) Always proteins
b) Inorganic molecules
c) Organic molecules that assist in enzyme function
d) Inhibitors of enzyme activity
Answer: c) Organic molecules that assist in enzyme function
14. Which of the following is an example of a coenzyme?
a) NAD+
b) Zinc
c) Hemoglobin
d) Cholesterol
Answer: a) NAD+
15. Allosteric regulation of enzymes involves:
a) Binding of molecules to sites other than the active site
b) Direct competition with the substrate
c) Irreversible inhibition
d) Changing the enzyme's primary structure
Answer: a) Binding of molecules to sites other than the active site
16. Enzyme cofactors are:
a) Always organic molecules
b) Always inorganic molecules
c) Can be either organic or inorganic molecules
d) Never required for enzyme function
Answer: c) Can be either organic or inorganic molecules
17. The Michaelis-Menten equation describes:
a) Enzyme inhibition
b) Enzyme-substrate affinity
c) Enzyme denaturation
d) Enzyme-catalyzed reaction rates
Answer: d) Enzyme-catalyzed reaction rates
18. Km in enzyme kinetics represents:
a) Maximum reaction velocity
b) Substrate concentration at half-maximum velocity
c) Enzyme concentration
d) Inhibitor concentration
Answer: b) Substrate concentration at half-maximum velocity
19. Vmax in enzyme kinetics represents:
a) Maximum reaction velocity
b) Minimum reaction velocity
c) Substrate concentration
d) Enzyme-substrate dissociation constant
Answer: a) Maximum reaction velocity
20. Feedback inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Allosteric regulation
d) Substrate-level regulation
Answer: c) Allosteric regulation
21. Enzymes increase the rate of chemical reactions by:
a) Changing the reaction equilibrium
b) Providing energy to the reactants
c) Lowering the activation energy
d) Increasing the substrate concentration
Answer: c) Lowering the activation energy
22. Which of the following is NOT a way to regulate enzyme activity?
a) Allosteric regulation
b) Covalent modification
c) Changing enzyme color
d) Compartmentalization
Answer: c) Changing enzyme color
23. Zymogens are:
a) Enzyme inhibitors
b) Inactive enzyme precursors
c) Coenzymes
d) Enzyme activators
Answer: b) Inactive enzyme precursors
24. An example of a zymogen is:
a) Pepsin
b) Pepsinogen
c) Trypsin
d) Amylase
Answer: b) Pepsinogen
25. The induced fit model of enzyme action suggests that:
a) Enzymes are rigid structures
b) Substrates change shape to fit the enzyme
c) The enzyme's active site changes shape to accommodate the substrate
d) Enzymes and substrates are always perfectly matched
Answer: c) The enzyme's active site changes shape to accommodate the substrate
26. Enzyme specificity refers to:
a) The ability of enzymes to work in specific pH ranges
b) The ability of enzymes to catalyze only certain reactions
c) The temperature sensitivity of enzymes
d) The ability of enzymes to be inhibited
Answer: b) The ability of enzymes to catalyze only certain reactions
27. Which of the following is an example of an oxidoreductase?
a) Lipase
b) Alcohol dehydrogenase
c) DNA ligase
d) Pepsin
Answer: b) Alcohol dehydrogenase
28. The turnover number of an enzyme refers to:
a) The number of substrate molecules converted to product per unit time
b) The number of inhibitor molecules bound per enzyme
c) The number of active sites per enzyme molecule
d) The number of cofactors required per reaction
Answer: a) The number of substrate molecules converted to product per unit time
29. Irreversible inhibitors:
a) Temporarily bind to the enzyme
b) Permanently inactivate the enzyme
c) Always bind to the active site
d) Increase enzyme activity
Answer: b) Permanently inactivate the enzyme
30. Which of the following is NOT a class of enzymes?
a) Hydrolases
b) Ligases
c) Polymerases
d) Catalases
Answer: d) Catalases
31. Enzyme-substrate complexes are:
a) Permanent structures
b) Transient intermediates
c) Final products of reactions
d) Enzyme inhibitors
Answer: b) Transient intermediates
32. The lock and key model of enzyme action was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: a) Emil Fischer
33. Isozymes are:
a) Enzymes that catalyze the same reaction but have different structures
b) Enzymes that catalyze different reactions
c) Enzyme inhibitors
d) Enzyme activators
Answer: a) Enzymes that catalyze the same reaction but have different structures
34. Which of the following factors typically increases enzyme activity?
a) Decreased temperature
b) Increased substrate concentration
c) Addition of competitive inhibitors
d) Extreme pH changes
Answer: b) Increased substrate concentration
35. The active site of an enzyme is usually:
a) A small portion of the total enzyme structure
b) The entire surface of the enzyme
c) Located at the center of the enzyme
d) Composed of non-protein elements
Answer: a) A small portion of the total enzyme structure
36. Enzyme denaturation results in:
a) Increased enzyme activity
b) Loss of enzyme function
c) Change in substrate specificity
d) Conversion of the enzyme to a zymogen
Answer: b) Loss of enzyme function
37. Which of the following is an example of a transferase?
a) Lipase
b) Kinase
c) Protease
d) Lyase
Answer: b) Kinase
38. The quaternary structure of enzymes refers to:
a) The sequence of amino acids
b) The three-dimensional shape of a single polypeptide chain
c) The arrangement of multiple polypeptide subunits
d) The primary structure of the active site
Answer: c) The arrangement of multiple polypeptide subunits
39. Enzyme assays are used to:
a) Determine enzyme structure
b) Measure enzyme activity
c) Synthesize new enzymes
d) Identify enzyme inhibitors
Answer: b) Measure enzyme activity
40. Which of the following is NOT a factor that can affect enzyme specificity?
a) Active site shape
b) Substrate binding orientation
c) Enzyme color
d) Presence of cofactors
Answer: c) Enzyme color
41. Ribozymes are:
a) Protein enzymes
b) RNA molecules with catalytic activity
c) DNA molecules with catalytic activity
d) Lipid-based enzymes
Answer: b) RNA molecules with catalytic activity
42. The primary structure of an enzyme refers to:
a) Its three-dimensional shape
b) The sequence of amino acids
c) The arrangement of subunits
d) The shape of the active site
Answer: b) The sequence of amino acids
43. Enzyme kinetics studies:
a) The structure of enzymes
b) The rate of enzyme-catalyzed reactions
c) The evolution of enzymes
d) The synthesis of enzymes in cells
Answer: b) The rate of enzyme-catalyzed reactions
44. Which of the following is an example of a lyase?
a) Aldolase
b) Lipase
c) Kinase
d) Ligase
Answer: a) Aldolase
45. Cooperative binding in enzymes refers to:
a) Multiple enzymes working together
b) The binding of one substrate molecule affecting the binding of subsequent molecules
c) The formation of enzyme-inhibitor complexes
d) The interaction between enzymes and coenzymes
Answer: b) The binding of one substrate molecule affecting the binding of subsequent
molecules
46. Enzyme promiscuity refers to:
a) The ability of enzymes to catalyze multiple different reactions
b) The specificity of enzymes for their substrates
c) The tendency of enzymes to denature easily
d) The requirement of enzymes for multiple cofactors
Answer: a) The ability of enzymes to catalyze multiple different reactions
47. Which of the following is NOT a method to study enzyme kinetics?
a) Spectrophotometry
b) Radioisotope labeling
c) X-ray crystallography
d) Fluorescence spectroscopy
Answer: c) X-ray crystallography
48. The Lineweaver-Burk plot is used to determine:
a) Enzyme structure
b) Enzyme kinetic parameters
c) Enzyme specificity
d) Enzyme evolution
Answer: b) Enzyme kinetic parameters
49. Allosteric enzymes typically have:
a) Only one subunit
b) Multiple subunits
c) No active site
d) No regulatory sites
Answer: b) Multiple subunits
50. Suicide inhibitors are:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Irreversible inhibitors
d) Allosteric activators
Answer: c) Irreversible inhibitors
51. The catalytic efficiency of an enzyme is often expressed as:
a) Km
b) Vmax
c) kcat/Km
d) Enzyme concentration
Answer: c) kcat/Km
52. Which of the following is an example of an isomerase?
a) Glucose-6-phosphate isomerase
b) DNA polymerase
c) Pyruvate kinase
d) Lipase
Answer: a) Glucose-6-phosphate isomerase
53. Enzyme engineering involves:
a) Modifying enzymes to improve their properties
b) Discovering new natural enzymes
c) Studying enzyme evolution
d) Inhibiting enzyme activity
Answer: a) Modifying enzymes to improve their properties
54. The use of enzymes in industrial processes is known as:
a) Enzyme therapy
b) Biocatalysis
c) Enzyme assay
d) Zymology
Answer: b) Biocatalysis
55. Which of the following is NOT a common application of enzymes in industry?
a) Food processing
b) Detergent manufacturing
c) Biofuel production
d) Computer chip manufacturing
Answer: d) Computer chip manufacturing
56. Enzyme immobilization is used to:
a) Increase enzyme stability
b) Decrease enzyme activity
c) Change enzyme specificity
d) Denature enzymes
Answer: a) Increase enzyme stability
57. The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
The term "abzyme" refers to:
a) A synthetic enzyme
b) An antibody with catalytic activity
c) A ribozyme
d) A zymogen
Answer: b) An antibody with catalytic activity
58. Enzyme therapeutics involve:
a) Using enzymes to treat diseases
b) Inhibiting enzyme activity in the body
c) Studying enzyme evolution
d) Producing enzymes in laboratories
Answer: a) Using enzymes to treat diseases
59. Which of the following is an example of an enzyme used in molecular biology?
a) Restriction endonuclease
b) Pepsin
c) Lipase
d) Alcohol dehydrogenase
Answer: a) Restriction endonuclease
60. The phenomenon where an enzyme catalyzes a reaction using a substrate that differs from
its physiological substrate is called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
61. Digestive enzymes are primarily produced by:
a) The liver
b) The pancreas
c) The stomach
d) The small intestine
Answer: b) The pancreas
62. Which of the following is NOT a digestive enzyme?
a) Amylase
b) Lipase
c) Trypsin
d) Catalase
Answer: d) Catalase
63. Enzyme-linked immunosorbent assay (ELISA) uses:
a) Radioactive labeling
b) Enzyme-conjugated antibodies
c) Fluorescent dyes
d) Magnetic resonance
Answer: b) Enzyme-conjugated antibodies
64. The branched pathway inhibition is an example of:
a) Competitive inhibition
b) Non-competitive inhibition
c) Feedback inhibition
d) Allosteric activation
Answer: c) Feedback inhibition
65. Which of the following enzymes is involved in DNA replication?
a) RNA polymerase
b) DNA ligase
c) Amylase
d) Pepsin
Answer: b) DNA ligase
66. Enzyme nomenclature is standardized by:
a) World Health Organization
b) International Union of Biochemistry and Molecular Biology
c) American Chemical Society
d) European Molecular Biology Organization
Answer: b) International Union of Biochemistry and Molecular Biology
67. The first enzyme to be crystallized was:
a) Urease
b) Pepsin
c) Amylase
d) Lipase
Answer: a) Urease
68. Enzymes that break down nucleic acids are called:
a) Proteases
b) Lipases
c) Nucleases
d) Amylases
Answer: c) Nucleases
69. The lock and key model of enzyme action was later modified to:
a) Induced fit model
b) Allosteric model
c) Competitive model
d) Cooperative model
Answer: a) Induced fit model
70. Which of the following is NOT a method to measure enzyme activity?
a) Spectrophotometry
b) Radioisotope labeling
c) Electrophoresis
d) Manometry
Answer: c) Electrophoresis
71. Enzyme inhibitors that bind to the enzyme-substrate complex are called:
a) Competitive inhibitors
b) Non-competitive inhibitors
c) Uncompetitive inhibitors
d) Allosteric inhibitors
Answer: c) Uncompetitive inhibitors
72. The rate-limiting enzyme in a metabolic pathway is typically:
a) The fastest enzyme
b) The slowest enzyme
c) The first enzyme in the pathway
d) The last enzyme in the pathway
Answer: b) The slowest enzyme
73. Which of the following is an example of an enzyme used in cheese production?
a) Rennet
b) Catalase
c) DNA polymerase
d) Alcohol dehydrogenase
Answer: a) Rennet
74. The term "turnover number" in enzyme kinetics refers to:
a) The number of substrate molecules converted to product per enzyme molecule per second
b) The number of enzyme molecules in a solution
c) The number of inhibitor molecules bound to an enzyme
d) The number of cofactors required by an enzyme
Answer: a) The number of substrate molecules converted to product per enzyme molecule
per second
75. Enzyme-substrate affinity is typically measured by:
a) Km
b) Vmax
c) kcat
d) Enzyme concentration
Answer: a) Km
76. Which of the following is NOT a way to regulate enzyme activity in cells?
a) Allosteric regulation
b) Covalent modification
c) Gene expression
d) Changing the color of the enzyme
Answer: d) Changing the color of the enzyme
77. The process of enzyme secretion in which the enzyme is released in an inactive form is
called:
a) Exocytosis
b) Endocytosis
c) Zymogen activation
d) Allosteric regulation
Answer: c) Zymogen activation
78. Which of the following enzymes is involved in the citric acid cycle?
a) Hexokinase
b) Amylase
c) Aconitase
d) Lipase
Answer: c) Aconitase
79. The primary function of restriction endonucleases is:
a) To catalyze the hydrolysis of proteins
b) To cut DNA at specific sequences
c) To join DNA fragments
d) To replicate DNA
Answer: b) To cut DNA at specific sequences
80. Enzyme engineering techniques do NOT include:
a) Site-directed mutagenesis
b) Directed evolution
c) Protein fusion
d) Spontaneous mutation
Answer: d) Spontaneous mutation
81. Which of the following is an example of a lyase?
a) Fumarase
b) Lipase
c) Kinase
d) Protease
Answer: a) Fumarase
82. The phenomenon where some enzymes can catalyze the reverse of their normal reaction is
called:
a) Reversibility
b) Enzyme promiscuity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Reversibility
83. Which of the following factors does NOT affect enzyme stability?
a) Temperature
b) pH
c) Enzyme color
d) Presence of denaturants
Answer: c) Enzyme color
84. The use of enzymes to diagnose diseases is known as:
a) Enzyme therapy
b) Enzyme engineering
c) Enzyme diagnostics
d) Enzyme kinetics
Answer: c) Enzyme diagnostics
85. Which of the following is NOT a characteristic of allosteric enzymes?
a) They have multiple subunits
b) They have regulatory sites
c) They follow Michaelis-Menten kinetics
d) They can be regulated by molecules other than the substrate
Answer: c) They follow Michaelis-Menten kinetics
86. The enzyme that catalyzes the first committed step in a metabolic pathway is often:
a) The rate-limiting enzyme
b) An isozyme
c) A hydrolase
d) A transferase
Answer: a) The rate-limiting enzyme
87. Which of the following is an example of an enzyme used in DNA amplification?
a) DNA ligase
b) Taq polymerase
c) Restriction endonuclease
d) RNA polymerase
Answer: b) Taq polymerase
88. The study of the rates of chemical reactions catalyzed by enzymes is called:
a) Enzyme structure
b) Enzyme kinetics
c) Enzyme thermodynamics
d) Enzyme evolution
Answer: b) Enzyme kinetics
89. Which of the following is NOT a method to immobilize enzymes?
a) Adsorption
b) Covalent bonding
c) Entrapment
d) Denaturation
Answer: d) Denaturation
90. The concept of the "induced fit" model was proposed by:
a) Emil Fischer
b) Daniel Koshland
c) Leonor Michaelis
d) Maud Menten
Answer: b) Daniel Koshland
91. Which of the following is an example of a transferase?
a) Hexokinase
b) Lipase
c) Pepsin
d) Urease
Answer: a) Hexokinase
92. The use of enzymes in the production of biofuels primarily involves:
a) Lipases
b) Cellulases
c) Proteases
d) DNA polymerases
Answer: b) Cellulases
93. Enzyme fingerprinting is a technique used in:
a) Enzyme purification
b) Enzyme immobilization
c) Enzyme characterization
d) Enzyme synthesis
Answer: c) Enzyme characterization
94. Which of the following is NOT a common method for enzyme production?
a) Extraction from natural sources
b) Recombinant DNA technology
c) Chemical synthesis
d) Solid-state fermentation
Answer: c) Chemical synthesis
95. The phenomenon where an enzyme catalyzes multiple reactions in a single active site is
called:
a) Enzyme promiscuity
b) Enzyme specificity
c) Allosteric regulation
d) Cooperative binding
Answer: a) Enzyme promiscuity
96. Which of the following enzymes is involved in the breakdown of hydrogen peroxide?
a) Catalase
b) Amylase
c) Lipase
d) Pepsin
Answer: a) Catalase
97. The use of enzymes in the treatment of genetic disorders is an example of:
a) Enzyme replacement therapy
b) Enzyme inhibition therapy
c) Enzyme diagnostics
d) Enzyme engineering
Answer: a) Enzyme replacement therapy
98. Which of the following is NOT a factor that can lead to enzyme denaturation?
a) Extreme pH
b) High temperature
c) Presence of heavy metals
d) Increased substrate concentration
Answer: d) Increased substrate concentration
99. The branch of biochemistry that deals with the study of enzymes is called:
a) Enzymology
b) Proteomics
c) Metabolomics
d) Genomics
Answer: a) Enzymology
100. Which of the following is an example of an enzyme used in the brewing industry?
a) Amylase
b) DNA ligase
c) Pepsin
d) Catalase
Answer: a) Amylase
