Biology assignment

Term: 2019 Summer

Assignment 2

Name: ___________________________ Time: _______________ Total: _________

1. True or False

(i) Viruses contain either RNA or DNA as a genetic material. Answer:___________

(ii) Virus having an arthropod as vector or intermediate host is called arbovirus.

Answer:___________

2. Select the correct pair. Answer:___________

(a) Acidic amino acid - Arginine

(b) Basic amino acid - Phenylalanine

(c) Alcoholic amino acid - Threonine

(d) Neutral amino acid – Cysteine

3. Which of the following is an example of polysaccharides? Answer:__________

(a) Sucrose (b) Maltose (c) Raffinose (d) Cellulose

4. Select the correct statement regarding nucleic acids. Answer:__________

(a) These are long chain micromolecules formed by polymerisation of nucleotides.

(b) The backbone of a DNA strand is built up of deoxyribose and phosphoric acid groups.

(c) The two DNA chains are identical.

(d) RNA is Fuelgen positive.

5. The double stranded DNA has 15% of cytosine. The percentage of adenine in DNA will be: Answer:__________

(a) 35% (b) 30% (c) 45% (d) 70%.

6. A phosphoglyceride is always made up of : Answer:__________

(a) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(b) a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule

(c) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(d) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.

7. In India, we find mangoes with different flavours, colours, fibre content, sugar content and even shelf-life. The large variation is on account of: Answer:__________

(a) species diversity (b) induced mutations

(c) genetic diversity (d) hybridisation.

8. Select the correct chronological order of the evolution of man.

Answer:__________

(a) Australopithecus → Homo erectus → Homo habilis→sapiens

(b) Australopithecus →Homo habilis→ Homo erectus →sapiens

(c) sapiens → Australopithecus → Homo erectus → Homo habilis

(d) sapiens → Australopithecus → Homo habilis → Homo erectus

9. Essential Amino Acids.

10.Describe the mechanism of inheritance of ABO blood groups in humans.