Question 1

In the 1920s, a dye that stained DNA a bright purple was developed.From this dye, biologists concluded that

Accepted Answer

A)  all organisms had the same amount of DNA. 
B)  DNA was present in higher amounts in gametes than it was in somatic cells. 
C)  DNA had a simple chemical structure. 
D)  the amount of DNA varied among species. 
E)  DNA was found in the cytoplasm of cells. 
A)  all organisms had the same amount of DNA. 
B)  DNA was present in higher amounts in gametes than it was in somatic cells. 
C)  DNA had a simple chemical structure. 
D)  the amount of DNA varied among species. 
E)  DNA was found in the cytoplasm of cells.

Question 2

In complementary base pairing, G will pair with

Accepted Answer

A)  A. 
B)  C. 
C)  G. 
D)  T. 
E)  any base. 
A)  A. 
B)  C. 
C)  G. 
D)  T. 
E)  any base.

Question 3

Okazaki fragments are found

Accepted Answer

A)  at just the leading strand in both prokaryotes and eukaryotes. 
B)  at just the lagging strand in both prokaryotes and eukaryotes. 
C)  at both the leading and lagging strands in both prokaryotes and eukaryotes. 
D)  only in prokaryotes. 
E)  only in eukaryotes. 
A)  at just the leading strand in both prokaryotes and eukaryotes. 
B)  at just the lagging strand in both prokaryotes and eukaryotes. 
C)  at both the leading and lagging strands in both prokaryotes and eukaryotes. 
D)  only in prokaryotes. 
E)  only in eukaryotes.

Question 4

In Griffith's experiment, why were S-type cells virulent and R-type cells not virulent?

Accepted Answer

A)  S-type cells contain the transforming substance, and R-type cells do not. 
B)  S-type cells have DNA, and R-type cells do not. 
C)  S-type cells have a protective smooth capsule, and R-type cells do not. 
D)  S-type cells could not be killed by heat treatment, and R-type cells could. 
E)  S-type cells were resistant to DNase treatment, and R-type cells were not. 
A)  S-type cells contain the transforming substance, and R-type cells do not. 
B)  S-type cells have DNA, and R-type cells do not. 
C)  S-type cells have a protective smooth capsule, and R-type cells do not. 
D)  S-type cells could not be killed by heat treatment, and R-type cells could. 
E)  S-type cells were resistant to DNase treatment, and R-type cells were not.

Question 5

In bacteria, there is/are _______ origin(s) of replication and _______ replication fork(s).

Accepted Answer

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

Question 6

Starting from one double-stranded DNA molecule, 128 DNA molecules can be generated via _______ rounds of PCR (assuming that the process is 100 percent efficient).

Accepted Answer

The answer of Starting from one double-stranded DNA molecule, 128...

Question 7

Bacteriophages are a DNA virus-their genetic material is DNA.In contrast, for some other types of viruses, RNA is the genetic material.Once it has entered a cell, one group of RNA viruses, which includes retroviruses, reverse transcribes the RNA into DNA using the enzyme reverse transcriptase.This protein is found bound to the viral RNA molecule.Suppose Hershey and Chase had unknowingly used a retrovirus for their classic blender experiment.Where would most of the 32P and the 35S be found at the conclusion of the experiment?

Accepted Answer

Like DNA, RNA has a phosphate backbone.

Question 8

The evidence suggesting that DNA is arranged in a double helix came from

Accepted Answer

A)  Franklin's X-ray crystallography. 
B)  Chargaff's observations of relative abundances of base purines and pyrimidines in DNA. 
C)  Avery's studies of DNA as the transforming agent. 
D)  the Hershey and Chase blender experiment. 
E)  studies examining the density of DNA. 
A)  Franklin's X-ray crystallography. 
B)  Chargaff's observations of relative abundances of base purines and pyrimidines in DNA. 
C)  Avery's studies of DNA as the transforming agent. 
D)  the Hershey and Chase blender experiment. 
E)  studies examining the density of DNA.

Question 9

Refer to the figure showing replication.   In the figure, the protein bound to the template DNA strand (blue) is DNA polymerase III.What is the next step in the replication process?

Accepted Answer

A)  DNA ligase will join the unbound segments. 
B)  Primase will add a primer within the gap. 
C)  DNA polymerase will join the unbound segments. 
D)  DNA polymerase will add an Okazaki fragment. 
E)  DNA helicase will remove the DNA polymerase. 
A)  DNA ligase will join the unbound segments. 
B)  Primase will add a primer within the gap. 
C)  DNA polymerase will join the unbound segments. 
D)  DNA polymerase will add an Okazaki fragment. 
E)  DNA helicase will remove the DNA polymerase.

Question 10

A researcher stains various types of cells from the same organism, using a dye that stains in direct proportion to the amount of DNA in the cell.The researcher finds that _______ cells have twice as much DNA in their nuclei as the organism's sperm do.

Accepted Answer

The answer of A researcher stains various types of cells...

Question 11

The nitrogenous bases of the two complementary strands in the DNA double helix are held together by

Accepted Answer

A)  van der Waals forces. 
B)  covalent bonds. 
C)  hydrogen bonds. 
D)  covalent and hydrogen bonds. 
E)  van der Waals forces and covalent bonds. 
A)  van der Waals forces. 
B)  covalent bonds. 
C)  hydrogen bonds. 
D)  covalent and hydrogen bonds. 
E)  van der Waals forces and covalent bonds.

Question 12

DNA polymerase from Thermus aquaticus is useful in PCR because it

Accepted Answer

A)  can replicate DNA in both directions. 
B)  has exceptional proofreading repair. 
C)  is a telomerase. 
D)  can withstand high temperatures. 
E)  can withstand cold temperatures. 
A)  can replicate DNA in both directions. 
B)  has exceptional proofreading repair. 
C)  is a telomerase. 
D)  can withstand high temperatures. 
E)  can withstand cold temperatures.

Question 13

In a double-stranded molecule of DNA, _______ percent of the nitrogenous bases are purines.

Accepted Answer

The answer of In a double-stranded molecule of DNA, _______...

Question 14

In eukaryotic cells, each chromosome has _______ origin(s) of replication.

Accepted Answer

A)  one 
B)  two 
C)  three 
D)  multiple 
E)  no 
A)  one 
B)  two 
C)  three 
D)  multiple 
E)  no

Question 15

Which feature of the Watson and Crick model of DNA structure explains its ability to function in replication and gene expression?

Accepted Answer

A)  Each strand contains all the information present in the double helix. 
B)  There are structural and functional similarities between DNA and RNA. 
C)  The double helix is right-handed, not left-handed. 
D)  DNA replication does not require enzyme catalysts. 
E)  Bases are exposed in the major groove of the double helix. 
A)  Each strand contains all the information present in the double helix. 
B)  There are structural and functional similarities between DNA and RNA. 
C)  The double helix is right-handed, not left-handed. 
D)  DNA replication does not require enzyme catalysts. 
E)  Bases are exposed in the major groove of the double helix.

Question 16

Which of the following does not demonstrate the stability of the DNA double helix?
a. High temperatures are required to denature it.
b. DNA helicases require ATP.
c. Single-strand binding proteins are required to keep the strands apart.
d. DNA synthesis requires energy.
e. Paired bases form hydrogen bonds.

Accepted Answer

The answer of Which of the following does not demonstrate...

Question 17

Refer to the figure.   Which statement identifies the figure as representing eukaryotic replication?

Accepted Answer

A)  Replication is bidirectional. 
B)  DNA has major and minor grooves. 
C)  Both DNA strands serve as templates for replication. 
D)  There are multiple origins of replication. 
E)  The DNA must first be unwound. 
A)  Replication is bidirectional. 
B)  DNA has major and minor grooves. 
C)  Both DNA strands serve as templates for replication. 
D)  There are multiple origins of replication. 
E)  The DNA must first be unwound.

Question 18

Refer to the figure, which illustrates the chemical structure of DNA.   In which position would new DNA be added?

Accepted Answer

A)  above A 
B)  above B 
C)  above D 
D)  below D 
E)  below E 
A)  above A 
B)  above B 
C)  above D 
D)  below D 
E)  below E

Question 19

Double-stranded DNA looks like a ladder that has been twisted into a helix or spiral.The side supports of the ladder are

Accepted Answer

A)  individual nitrogenous bases. 
B)  alternating bases and sugars. 
C)  alternating bases and phosphate groups. 
D)  alternating sugars and phosphates. 
E)  alternating bases, sugars, and phosphates. 
A)  individual nitrogenous bases. 
B)  alternating bases and sugars. 
C)  alternating bases and phosphate groups. 
D)  alternating sugars and phosphates. 
E)  alternating bases, sugars, and phosphates.

Question 20

The Meselson-Stahl experiment showed that DNA replication is

Accepted Answer

A)  conservative. 
B)  semiconservative. 
C)  a mixture of semiconservative and conservative. 
D)  dispersive. 
E)  dissociated. 
A)  conservative. 
B)  semiconservative. 
C)  a mixture of semiconservative and conservative. 
D)  dispersive. 
E)  dissociated.

Exam 13: Dna and Its Role in Heredity

In the 1920s, a dye that stained DNA a bright purple was developed.From this dye, biologists concluded that

In complementary base pairing, G will pair with

Okazaki fragments are found

In Griffith's experiment, why were S-type cells virulent and R-type cells not virulent?

In bacteria, there is/are _______ origin(s) of replication and _______ replication fork(s).

Starting from one double-stranded DNA molecule, 128 DNA molecules can be generated via _______ rounds of PCR (assuming that the process is 100 percent efficient).

The evidence suggesting that DNA is arranged in a double helix came from

Refer to the figure showing replication. In the figure, the protein bound to the template DNA strand (blue) is DNA polymerase III.What is the next step in the replication process?

A researcher stains various types of cells from the same organism, using a dye that stains in direct proportion to the amount of DNA in the cell.The researcher finds that _______ cells have twice as much DNA in their nuclei as the organism's sperm do.

The nitrogenous bases of the two complementary strands in the DNA double helix are held together by

DNA polymerase from Thermus aquaticus is useful in PCR because it

In a double-stranded molecule of DNA, _______ percent of the nitrogenous bases are purines.

In eukaryotic cells, each chromosome has _______ origin(s) of replication.

Which feature of the Watson and Crick model of DNA structure explains its ability to function in replication and gene expression?

Refer to the figure. Which statement identifies the figure as representing eukaryotic replication?

Refer to the figure, which illustrates the chemical structure of DNA. In which position would new DNA be added?

Double-stranded DNA looks like a ladder that has been twisted into a helix or spiral.The side supports of the ladder are

The Meselson-Stahl experiment showed that DNA replication is

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In bacteria, there is/are _ origin(s) of replication and _ replication fork(s).