Question 1

How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?

Accepted Answer

A)  The DNA molecule would have irregular widths along its length.
B)  The DNA molecule would be longer.
C)  The DNA molecule would be circular.
D)  The DNA molecule would be shorter.E) C) and D)
F) B) and C)

Question 2

Which of the following occurs when RNA polymerase attaches to the promoter DNA?

Accepted Answer

A)  initiation of a new polypeptide chain
B)  elongation of the growing RNA molecule
C)  termination of the RNA molecule
D)  initiation of a new RNA moleculeE) B) and C)
F) A) and D)

Question 3

Which of the following enzymes catalyzes the elongation of a new DNA strand?

Accepted Answer

A)  DNA polymerase
B)  single- stranded binding protein
C)  ligase
D)  helicaseE) A) and B)
F) None of the above

Question 4

What kind of virus is HIV?

Accepted Answer

A)  a complex virus
B)  a retrovirus
C)  a provirus
D)  a paramyxovirusE) B) and C)
F) B) and D)

Question 5

Which of the following features characterizes the lytic cycle of a viral infection?

Accepted Answer

A)  The viral genes typically remain inactive once they are inside the host cell.
B)  The cycle typically leads to the lysis of the host cell.
C)  The virus reproduces outside of the host cell.
D)  The cycle typically ends when the host bacterium divides.E) C) and D)
F) All of the above

Question 6

The shape of a DNA molecule is most like

Accepted Answer

A)  a twisted rope ladder.
B)  beads on a string.
C)  a ladder.
D)  a set of railroad tracks.E) B) and D)
F) None of the above

Question 7

The transfer of genetic information from DNA to RNA is called

Accepted Answer

A)  elongation.
B)  initiation.
C)  transcription.
D)  translation.E) A) and C)
F) All of the above

Question 8

What nucleotide sequence would be found on the partner DNA strand of the strand shown?

Accepted Answer

A)  ACTGT
B)  TGACA
C)  UGAGA
D)  TGUGUE) None of the above
F) B) and D)

Question 9

The "one gene- one polypeptide" theory states that

Accepted Answer

A)  the function of each polypeptide is to regulate the synthesis of each corresponding gene.
B)  the synthesis of each gene is catalyzed by one specific enzyme.
C)  the function of an individual gene is to dictate the production of a specific polypeptide.
D)  the synthesis of each enzyme is catalyzed by one specific gene.E) B) and C)
F) A) and D)

Question 10

Which of the following statements regarding a DNA double helix is always true?

Accepted Answer

A)  The amount of adenine is equal to the amount of cytosine,and the amount of guanine is equal to the amount of thymine.
B)  The amount of adenine is equal to the amount of uracil,and the amount of guanine is equal to the amount of cytosine.
C)  The amount of adenine is equal to the amount of thymine,and the amount of guanine is equal to the amount of cytosine.
D)  The amount of adenine is equal to the amount of guanine,and the amount of thymine is equal to the amount of cytosine.E) A) and B)
F) A) and C)

Question 11

Conjugation,transformation,and transduction are all ways that bacteria

Accepted Answer

A)  increase their genetic diversity.
B)  reduce their DNA content.
C)  alter their oxygen requirements.
D)  increase the amount of RNA in the cytoplasm.E) A) and B)
F) A) and C)

Question 12

The copying mechanism of DNA is most like

Accepted Answer

A)  using a photographic negative to make a positive image.
B)  carving a figure out of wood.
C)  mixing flour,sugar,and water to make bread dough.
D)  dripping water out of a faucet.E) A) and D)
F) None of the above

Question 13

The directions for each amino acid in a polypeptide are indicated by a codon that consists of nucleotide(s) in an RNA molecule.

Accepted Answer

A)  2
B)  5
C)  3
D)  4E) A) and C)
F) None of the above

Question 14

Conjugation between a bacterium that lacks an F factor (F- ) and a bacterium that has an F factor on its chromosome (F+) could produce which of the following results?

Accepted Answer

A)  The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F- bacterium,and the F- bacterium ends up with a chromosome that lacks those genes.
B)  The F- bacterium ends up with a recombinant chromosome that carries some genes from the F+ bacterium,and the F+ bacterium ends up with an unaltered chromosome.
C)  The F- bacterium ends up carrying one or more plasmids from the F+ bacterium; the F+ bacterium is unchanged.
D)  The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F- bacterium,and the F- bacterium ends up with an unaltered chromosome.E) All of the above
F) A) and D)

Question 15

When one DNA molecule is copied to make two DNA molecules,the new DNA contains

Accepted Answer

A)  none of the parent DNA.
B)  100% of the parent DNA
C)  75% of the parent DNA.
D)  50% of the parent DNA.E) B) and C)
F) A) and D)

Question 16

Which of the following statements is false?

Accepted Answer

A)  During polypeptide initiation,an mRNA,the first amino acid attached to its tRNA,and the two subunits of a ribosome are brought together.
B)  During the first step of initiation,an mRNA molecule binds to a small ribosomal subunit.
C)  An mRNA molecule transcribed from DNA is shorter than the genetic message it carries.
D)  Translation consists of initiation,elongation,and termination.E) B) and D)
F) C) and D)

Question 17

Multiple origins of replication on the DNA molecules of eukaryotic cells serve to

Accepted Answer

A)  remove errors in DNA replication.
B)  assure the correct orientation of the two strands in the newly growing double helix.
C)  shorten the time necessary for DNA replication.
D)  create multiple copies of the DNA molecule at the same time.E) None of the above
F) C) and D)

Question 18

Which of the following statements about herpesviruses is false?

Accepted Answer

A)  Herpesviruses acquire their envelopes from the host cell nuclear membrane.
B)  Herpesviruses reproduce inside the host cell's mitochondria.
C)  Herpesviruses may remain latent for long periods of time while inside the host cell nucleus.
D)  Herpesviruses may cause cold sores or genital sores to appear during times of physical or emotional stress.E) All of the above
F) B) and C)

Question 19

A physical or chemical agent that changes the nucleotide sequence of DNA is called a(n)

Accepted Answer

A)  anticodon.
B)  transposon.
C)  mutagen.
D)  terminator.E) B) and C)
F) None of the above

Question 20

Which of the following enzymes does HIV use to synthesize DNA on an RNA template?

Accepted Answer

A)  ligase
B)  reverse transcriptase
C)  DNA convertase
D)  RNA polymeraseE) C) and D)
F) B) and D)

Exam 10: Molecular Biology of the Gene

Which of the following occurs when RNA polymerase attaches to the promoter DNA?

Correct AnswerverifiedShow Answer

How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?

Correct AnswerverifiedShow Answer

Which of the following statements regarding a DNA double helix is always true?

Correct AnswerverifiedShow Answer

When one DNA molecule is copied to make two DNA molecules,the new DNA contains

Correct AnswerverifiedShow Answer

Which of the following statements about herpesviruses is false?

Correct AnswerverifiedShow Answer

Which of the following enzymes does HIV use to synthesize DNA on an RNA template?

Correct AnswerverifiedShow Answer

The directions for each amino acid in a polypeptide are indicated by a codon that consists of nucleotide(s) in an RNA molecule.

Correct AnswerverifiedShow Answer

Multiple origins of replication on the DNA molecules of eukaryotic cells serve to

Correct AnswerverifiedShow Answer

Conjugation,transformation,and transduction are all ways that bacteria

Correct AnswerverifiedShow Answer

The shape of a DNA molecule is most like

Correct AnswerverifiedShow Answer

Which of the following enzymes catalyzes the elongation of a new DNA strand?

Correct AnswerverifiedShow Answer

Conjugation between a bacterium that lacks an F factor (F- ) and a bacterium that has an F factor on its chromosome (F+) could produce which of the following results?

Correct AnswerverifiedShow Answer

What kind of virus is HIV?

Correct AnswerverifiedShow Answer

Which of the following statements is false?

Correct AnswerverifiedShow Answer

What nucleotide sequence would be found on the partner DNA strand of the strand shown?

Correct AnswerverifiedShow Answer

The transfer of genetic information from DNA to RNA is called

Correct AnswerverifiedShow Answer

Which of the following features characterizes the lytic cycle of a viral infection?

Correct AnswerverifiedShow Answer

The "one gene- one polypeptide" theory states that

Correct AnswerverifiedShow Answer

A physical or chemical agent that changes the nucleotide sequence of DNA is called a(n)

Correct AnswerverifiedShow Answer

The copying mechanism of DNA is most like

Correct AnswerverifiedShow Answer

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