Question 1

If one strand of DNA has a C attached to a sugar with a free 5F1F1F1S1F1F1F10 phosphate group, the other strand will have a _______ attached to a sugar with a free _______ group.

Accepted Answer

A)  C; 5F1F1F1S1F1F1F10 phosphate 
B)  C; 3F1F1F1S1F1F1F10 hydroxyl 
C)  G; 5F1F1F1S1F1F1F10 phosphate 
D)  G; 3F1F1F1S1F1F1F10 phosphate 
E)  G; 3F1F1F1S1F1F1F10 hydroxyl

Question 2

In many eukaryotes, there are repetitive sequences called telomeres at the ends of chromosomes.After successive rounds of DNA replication, the _______ strand becomes shorter.In some cells, an enzyme called _______ repairs the shortened strand.
a. lagging; telomerase
b. leading; DNA polymerase I
c. leading; replicase
d. lagging; DNA polymerase I
e. leading; telomerase

Accepted Answer

The answer of In many eukaryotes, there are repetitive sequences...

Question 3

If 28 percent of the bases in a sample of DNA are T, _______ percent must be G.

Accepted Answer

A)  11 
B)  14 
C)  22 
D)  24 
E)  28

Question 4

Refer to the figure, which shows DNA replication.  Which diagram (A or B) shows semiconservative replication?

Accepted Answer

The answer of Refer to the figure, which shows DNA...

Question 5

If Hershey and Chase had found 32P in both the pellet and the supernatant of the phage-infected bacteria, what would have been their likely conclusion about the nature of genetic material?

Accepted Answer

A)  A protein must be the information molecule. 
B)  DNA is the genetic information molecule. 
C)  Phage must have stuck to the bacteria. 
D)  Phosphorus was in the information molecule. 
E)  No conclusion would have been possible from these results.

Question 6

Refer to the figure of a DNA molecule.  One can deduce all of the following information from this image except

Accepted Answer

A)  DNA is antiparallel. 
B)  DNA has major and minor grooves. 
C)  DNA complementary base pairing occurs between purines and pyrimidines. 
D)  DNA is a double-stranded helix. 
E)  DNA contains noncovalently bonded nucleotides.

Question 7

If a sequence in one strand of DNA is 5ʹ-AGCTGCTGA-3ʹ, what is the sequence in the complementary strand?

Accepted Answer

A)  5ʹ-AGCTGCTGA-3ʹ 
B)  3ʹ-AGCTGCTGA-5ʹ 
C)  5ʹ-TCGACGACT-3ʹ 
D)  3ʹ-TCGATGACT-5ʹ 
E)  3ʹ-TCGACGACT-5ʹ

Question 8

If the Meselson-Stahl density gradient experiment had resulted in two bands of DNA molecules after only one round of replication, one containing only ¹⁵N and the second only ¹⁴N, this result would have indicated that replication was a. conservative. b. dispersive. c. bidirectional. d. semiconservative e. unidirectional.

Accepted Answer

The answer of If the Meselson-Stahl density gradient experiment had...

Question 9

In organisms that contain circular DNA,

Accepted Answer

A)  there are often multiple origins of replication. 
B)  DNA replication is conservative. 
C)  the replication complex moves in both directions around the circle. 
D)  the chromosome must first be linearized to enable replication. 
E)  DNA replication is slow.

Question 10

A researcher would like to separate viral DNA from the viral coat proteins using a density gradient.Which material would she use to set the density gradient?

Accepted Answer

A)  Heavy nitrogen 
B)  Heavy oxygen 
C)  Radioactive carbon 
D)  Cesium chloride 
E)  Sodium chloride

Question 11

What prevents the DNA repair system from "repairing" telomeres?

Accepted Answer

A)  Telomerase is bound to telomeres and thus blocks the repair system from binding to telomeres. 
B)  Telomerase catalyzes reactions instead of the repair system. 
C)  DNA polymerase blocks the repair system from accessing the telomere DNA. 
D)  Telomeres are at the end of the chromosome, and DNA is replicated in only one direction. 
E)  Protective proteins bind to telomeres, and therefore the repair system does not recognize telomeres as breaks.

Question 12

If a single cycle of PCR takes 5 minutes, how long should it take to amplify one double-stranded molecule into 64?

Accepted Answer

A)  6 minutes 
B)  30 minutes 
C)  60 minutes 
D)  315 minutes 
E)  320 minutes

Question 13

The nucleotides that make up a DNA molecule each contain _______ phosphate group(s).Before they are added to the DNA, the precursors to nucleotides each contain _______ phosphate group(s).

Accepted Answer

A)  one; two 
B)  one; three 
C)  two; one 
D)  two; three 
E)  three; one

Question 14

Bacteria from hot springs greatly helped the development of PCR by

Accepted Answer

A)  providing a salt solution. 
B)  providing a heat-tolerant DNA polymerase. 
C)  assisting the polymerase. 
D)  providing annealing factors. 
E)  providing a means by which to separate DNA strands.

Question 15

Which feature of DNA replication is a consequence of semiconservative replication?

Accepted Answer

A)  Okazaki fragments are synthesized as part of the lagging strand. 
B)  Replication forks represent areas of active DNA synthesis on the chromosomes. 
C)  DNA replication is processive. 
D)  Polymerases function in the vicinity of replication forks. 
E)  The sliding clamp increases the rate of DNA synthesis.

Question 16

You are a biologist working with a cell culture.You notice that the chromosomes are decreasing in size with each cell division.Other than that, the cells seem healthy.What is the most likely explanation?

Accepted Answer

A)  Too much DNA ligase is being produced. 
B)  Too little DNA ligase is being produced. 
C)  Too much telomerase is being produced. 
D)  Too little telomerase is being produced. 
E)  Too little DNA helicase is being produced.

Question 17

The "P" in "PCR" stands for _______.

Accepted Answer

The answer of The "P" in "PCR" stands for _______....

Question 18

Refer to the figure, which shows DNA complementary base pairing.  Explain the difference between conservative and semiconservative models of DNA replication.What were the experimental results that supported the semiconservative model? What would the results have looked like if the conservative model of DNA replication had been accurate? Are there any other potential hypotheses?

Accepted Answer

The answer of Refer to the figure, which shows DNA...

Question 19

Researchers have determined the chemical composition of a molecule that interacts with DNA.To understand how it binds to a DNA molecule, the researchers can utilize _______ to deduce the physical structure of the molecule.

Accepted Answer

The answer of Researchers have determined the chemical composition of...

Question 20

If the enzyme _______ were nonfunctional, the double helix would not be able to unwind and separate into single strands.

Accepted Answer

The answer of If the enzyme _______ were nonfunctional, the...

Exam 13: Dna and Its Role in Heredity

If one strand of DNA has a C attached to a sugar with a free 5 phosphate group, the other strand will have a _ attached to a sugar with a free _ group.

If 28 percent of the bases in a sample of DNA are T, _______ percent must be G.

Refer to the figure, which shows DNA replication. Which diagram (A or B) shows semiconservative replication?

If Hershey and Chase had found ³²P in both the pellet and the supernatant of the phage-infected bacteria, what would have been their likely conclusion about the nature of genetic material?

Refer to the figure of a DNA molecule. One can deduce all of the following information from this image except

If a sequence in one strand of DNA is 5ʹ-AGCTGCTGA-3ʹ, what is the sequence in the complementary strand?

In organisms that contain circular DNA,

A researcher would like to separate viral DNA from the viral coat proteins using a density gradient.Which material would she use to set the density gradient?

What prevents the DNA repair system from "repairing" telomeres?

If a single cycle of PCR takes 5 minutes, how long should it take to amplify one double-stranded molecule into 64?

The nucleotides that make up a DNA molecule each contain _ phosphate group(s) .Before they are added to the DNA, the precursors to nucleotides each contain _ phosphate group(s) .

Bacteria from hot springs greatly helped the development of PCR by

Which feature of DNA replication is a consequence of semiconservative replication?

You are a biologist working with a cell culture.You notice that the chromosomes are decreasing in size with each cell division.Other than that, the cells seem healthy.What is the most likely explanation?

The "P" in "PCR" stands for _______.

Researchers have determined the chemical composition of a molecule that interacts with DNA.To understand how it binds to a DNA molecule, the researchers can utilize _______ to deduce the physical structure of the molecule.

If the enzyme _______ were nonfunctional, the double helix would not be able to unwind and separate into single strands.

Exam 13: Dna and Its Role in Heredity

If one strand of DNA has a C attached to a sugar with a free 5 phosphate group, the other strand will have a _______ attached to a sugar with a free _______ group.

If 28 percent of the bases in a sample of DNA are T, _______ percent must be G.

Refer to the figure, which shows DNA replication. Which diagram (A or B) shows semiconservative replication?

If Hershey and Chase had found 32P in both the pellet and the supernatant of the phage-infected bacteria, what would have been their likely conclusion about the nature of genetic material?

Refer to the figure of a DNA molecule. One can deduce all of the following information from this image except

If a sequence in one strand of DNA is 5ʹ-AGCTGCTGA-3ʹ, what is the sequence in the complementary strand?

In organisms that contain circular DNA,

A researcher would like to separate viral DNA from the viral coat proteins using a density gradient.Which material would she use to set the density gradient?

What prevents the DNA repair system from "repairing" telomeres?

If a single cycle of PCR takes 5 minutes, how long should it take to amplify one double-stranded molecule into 64?

The nucleotides that make up a DNA molecule each contain _______ phosphate group(s) .Before they are added to the DNA, the precursors to nucleotides each contain _______ phosphate group(s) .

Bacteria from hot springs greatly helped the development of PCR by

Which feature of DNA replication is a consequence of semiconservative replication?

You are a biologist working with a cell culture.You notice that the chromosomes are decreasing in size with each cell division.Other than that, the cells seem healthy.What is the most likely explanation?

The "P" in "PCR" stands for _______.

Researchers have determined the chemical composition of a molecule that interacts with DNA.To understand how it binds to a DNA molecule, the researchers can utilize _______ to deduce the physical structure of the molecule.

If the enzyme _______ were nonfunctional, the double helix would not be able to unwind and separate into single strands.

If one strand of DNA has a C attached to a sugar with a free 5 phosphate group, the other strand will have a _ attached to a sugar with a free _ group.

If Hershey and Chase had found ³²P in both the pellet and the supernatant of the phage-infected bacteria, what would have been their likely conclusion about the nature of genetic material?

The nucleotides that make up a DNA molecule each contain _ phosphate group(s) .Before they are added to the DNA, the precursors to nucleotides each contain _ phosphate group(s) .