QUESTION 1 Base pairing occurs between A and C. explains the X-ray results from

Question

QUESTION 1

Base pairing

occurs between A and C.

explains the X-ray results from Rosalind Franklin.

occurs between identical bases.

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

requires hydrogen bonds.

5 points   

QUESTION 2

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

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

it results in two nonidentical DNA molecules.

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

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

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

5 points   

QUESTION 3

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

uracil.

thymine.

cytosine.

guanine.

adenine.

5 points   

QUESTION 4

DNA replication

is constantly happening in a cell.

takes place in the nucleus of the cell.

occurs in G1 of interphase.

does not require proteins.

occurs in the cytoplasm of the cell.

5 points   

QUESTION 5

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

DNA ligases.

restriction enzymes.

vectors.

RNA polymerases.

DNA polymerases.

5 points   

QUESTION 6

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

DNA ligase

protease

RNA polymerase

DNA polymerase

restriction enzymes

5 points   

QUESTION 7

In eukaryotes, transcription occurs in the

cytoplasm.

cell membrane.

nucleus.

mitochondria.

ribosome.

5 points   

QUESTION 8

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

understanding DNA replication.

Griffith’s results with transformation.

X-ray data from Rosalind Franklin.

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

the discovery that DNA is wound around histone proteins.

5 points   

QUESTION 9

The anticodon of the tRNA molecule base pairs with

DNA.

mRNA.

amino acids.

rRNA.

polypeptides.

5 points   

QUESTION 10

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

mtDNA.

DNA.

tRNA.

mRNA.

rRNA.

5 points   

QUESTION 11

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

tRNA

bRNA

sRNA

rRNA

mRNA

5 points   

QUESTION 12

The two subunits of the ribosome join during

elongation.

termination of translation.

initiation of translation.

promotion of transcription.

termination of transcription.

5 points   

QUESTION 13

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

one codon codes for one amino acid.

each triplet codes for one amino acid.

each triplet codes for a different amino acid.

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

some codons code for the same amino acid.

5 points   

QUESTION 14

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

ribosomes.

nucleosomes.

chromatin.

nucleoli.

lysosomes.

5 points   

QUESTION 15

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

bases.

hydrogen bonds.

phosphate molecules.

sugar molecules.

sulfide bonds.

5 points   

QUESTION 16

A component of bacteria that are often used in biotechnology are

polypeptides.

exons.

operons.

introns.

plasmids.

5 points   

QUESTION 17

Normal human body cells contain how many chromosomes?

46

44

42

22

23

5 points   

QUESTION 18

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

the 3’ carbon atom of the sugar molecule.

the 2’ carbon atom of the sugar molecule.

the 1’ carbon atom of the sugar molecule.

the 5’ carbon atom of the sugar molecule.

the 4’ carbon atom of the sugar molecule.

5 points   

QUESTION 19

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

separation of the two strands.

polymerization of DNA.

joining of the two strands.

formation of the histone core.

mitotic division.

5 points   

QUESTION 20

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

genetic material normally contains radioactive isotopes.

the viruses did not contain DNA.

the viruses did not contain protein.

DNA was entering into the infected bacteria.

protein was entering into the infected bacteria

A.

occurs between A and C.

B.

explains the X-ray results from Rosalind Franklin.

C.

occurs between identical bases.

D.

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

E.

requires hydrogen bonds.

Explanation / Answer

Answers:

1. E

2. A

3. D

4. B

5. B

6. A

7. C

8. C

9. B

10. D

11. E

12. C

13. E

14. B

15. D

16. E

17. A

18. C

19. A

20. D

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