Tutoring 4

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QUESTION 1

· DNA replication




·

· A.

· occurs in G1 of interphase.

·

· B.

· is constantly happening in a cell.

·

· C.

· does not require proteins.

·

· D.

· takes place in the nucleus of the cell.

·

· E.

· occurs in the cytoplasm of the cell.

· 




5 points  

QUESTION 2

· The anticodon of the tRNA molecule base pairs with




·

· A.

· polypeptides.

·

· B.

· mRNA.

·

· C.

· DNA.

·

· D.

· rRNA.

·

· E.

· amino acids.

· 




5 points  

QUESTION 3

· In DNA, cytosine bonds to guanine. In RNA, cytosine bonds to




·

· A.

· adenine.

·

· B.

· uracil.

·

· C.

· cytosine.

·

· D.

· thymine.

·

· E.

· guanine.

· 




5 points  

QUESTION 4

· The most important experimental results that suggested to Watson and Crick that DNA was in the form of a helix was




·

· A.

· X-ray data from Rosalind Franklin.

·

· B.

· understanding DNA replication.

·

· C.

· the findings of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C.

·

· D.

· the discovery that DNA is wound around histone proteins.

·

· E.

· Griffith’s results with transformation.

· 




5 points  

QUESTION 5

· Normal human body cells contain how many chromosomes?




·

· A.

· 46

·

· B.

· 22

·

· C.

· 23

·

· D.

· 42

·

· E.

· 44

· 




5 points  

QUESTION 6

· A package of histones with DNA wrapped around them forms spherical structures called




·

· A.

· ribosomes.

·

· B.

· nucleoli.

·

· C.

· lysosomes.

·

· D.

· nucleosomes.

·

· E.

· chromatin.

· 




5 points  

QUESTION 7

· The bases are bonded to what part of the backbone of the DNA molecule?




·

· A.

· the 4’ carbon atom of the sugar molecule.

·

· B.

· the 1’ carbon atom of the sugar molecule.

·

· C.

· the 2’ carbon atom of the sugar molecule.

·

· D.

· the 3’ carbon atom of the sugar molecule.

·

· E.

· the 5’ carbon atom of the sugar molecule.

· 




5 points  

QUESTION 8

· The fact that the two strands composing a DNA molecule are called antiparallel has to do with the orientation of the




·

· A.

· sulfide bonds.

·

· B.

· phosphate molecules.

·

· C.

· bases.

·

· D.

· hydrogen bonds.

·

· E.

· sugar molecules.

· 




5 points  

QUESTION 9

· DNA replication of a single DNA molecule is referred to as semiconservative because




·

· A.

· it results in two nonidentical DNA molecules.

·

· B.

· of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA.

·

· C.

· all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA.

·

· D.

· one DNA strand is replicated continuously, while the other must be replicated discontinuously.

·

· E.

· each of the two DNA molecules will consist of one parental strand and one newly synthesized strand.

· 




5 points  

QUESTION 10

· Base pairing




·

· A.

· occurs between identical bases.

·

· B.

· takes place between sugars and phosphates on the two strands in a helix.

·

· C.

· requires hydrogen bonds.

·

· D.

· occurs between A and C.

·

· E.

· explains the X-ray results from Rosalind Franklin.

· 




5 points  

QUESTION 11

· The two subunits of the ribosome join during




·

· A.

· initiation of translation.

·

· B.

· termination of transcription.

·

· C.

· promotion of transcription.

·

· D.

· elongation.

·

· E.

· termination of translation.

· 




5 points  

QUESTION 12

· In eukaryotes, transcription occurs in the




·

· A.

· nucleus.

·

· B.

· mitochondria.

·

· C.

· cell membrane.

·

· D.

· cytoplasm.

·

· E.

· ribosome.

· 




5 points  

QUESTION 13

· In recombinant DNA technology, enzymes used to precisely cut DNA are called




·

· A.

· RNA polymerases.

·

· B.

· restriction enzymes.

·

· C.

· DNA polymerases.

·

· D.

· vectors.

·

· E.

· DNA ligases.

· 




5 points  

QUESTION 14

· We refer to the DNA code as being redundant or repetitive. This means that




·

· A.

· each triplet codes for one amino acid.

·

· B.

· one codon codes for one amino acid.

·

· C.

· a single triplet may code for more than one amino acid.

·

· D.

· some codons code for the same amino acid.

·

· E.

· each triplet codes for a different amino acid.

· 




5 points  

QUESTION 15

· What step in DNA replication precedes the pairing of complementary bases?




·

· A.

· joining of the two strands.

·

· B.

· separation of the two strands.

·

· C.

· formation of the histone core.

·

· D.

· polymerization of DNA.

·

· E.

· mitotic division.

· 




5 points  

QUESTION 16

· A component of bacteria that are often used in biotechnology are




·

· A.

· plasmids.

·

· B.

· introns.

·

· C.

· polypeptides.

·

· D.

· exons.

·

· E.

· operons.

· 




5 points  

QUESTION 17

· When looking at a table depicting the genetic code, the base sequences signify




·

· A.

· mtDNA.

·

· B.

· rRNA.

·

· C.

· tRNA.

·

· D.

· DNA.

·

· E.

· mRNA.

· 




5 points  

QUESTION 18

· Hershey and Chase performed an experiment in which they used radioactive isotopes to phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that




·

· A.

· the viruses did not contain DNA.

·

· B.

· genetic material normally contains radioactive isotopes.

·

· C.

· protein was entering into the infected bacteria.

·

· D.

· DNA was entering into the infected bacteria.

·

· E.

· the viruses did not contain protein.

· 




5 points  

QUESTION 19

· What form of RNA carries instructions from the nucleus to the ribosome?




·

· A.

· bRNA

·

· B.

· sRNA

·

· C.

· mRNA

·

· D.

· tRNA

·

· E.

· rRNA

· 




5 points  

QUESTION 20

· What enzyme is used to “glue” together the ends of cut pieces of DNA?




·

· A.

· DNA polymerase

·

· B.

· DNA ligase

·

· C.

· protease

·

· D.

· RNA polymerase

·

· E.

· restriction enzymes