Question 1

Which of the following is classified as a frameshift mutagen?

Accepted Answer

A)   acridine
B)   ethidium bromide
C)   benzopyrene
D)   Both A and B are correct.
E)   A, B, and C are correct.F) A) and B)
G) C) and D)

Question 2

Why is Taq polymerase used in PCR?

Accepted Answer

A)   It resists the high temperatures of PCR better than other polymerases.
B)   It can unwind DNA from associated histones.
C)   It makes DNA more quickly than other types of polymerases.
D)   It makes fewer mistakes than other types of polymerases.
E)   It corrects frameshift mutations as it replicates DNA.F) A) and E)
G) A) and B)

Question 3

During translation, an mRNA codon will pass through which of the following sequences of tRNA binding sites on the ribosome?

Accepted Answer

A)   A site, E site, P site
B)   P site, A site, E site
C)   P site, E site, A site
D)   E site, P site, A site
E)   A site, P site, E siteF) C) and D)
G) A) and E)

Question 4

Which of the following must be removed from an mRNA molecule before it can be translated in eukaryotes?

Accepted Answer

A)   introns
B)   codons
C)   promoters
D)   exons
E)   anticodonsF) A) and D)
G) A) and B)

Question 5

In conjugation, F+cells

Accepted Answer

A)   can transfer DNA only to other F+ cells.
B)   contain an F plasmid.
C)   contain "jumping genes."
D)   do not have conjugation pili.
E)   serve as recipient cells.F) A) and E)
G) B) and E)

Question 6

All of the following statements concerning transcription in bacteria are true EXCEPT:

Accepted Answer

A)   Sigma factors are parts of RNA polymerase that recognize promoter regions.
B)   It occurs in the nucleoid region.
C)   Termination is either self- induced or due to the presence of Rho protein.
D)   A variety of sigma factors affect transcription.
E)   The same RNA polymerase transcribes primer RNA, mRNA, tRNA, and rRNA.F) C) and E)
G) B) and D)

Question 7

Which of the following is a DNA repair enzyme activated by visible light?

Accepted Answer

A)   primase
B)   DNA photolyase
C)   DNA ligase
D)   bacteriocin
E)   transposaseF) B) and D)
G) All of the above

Question 8

The point at which a DNA double helix is "unzipped" is the .

Accepted Answer

The answer of The point at which a DNA double...

Question 9

If the codon AAA is changed to UAA, it no longer codes for an amino acid; instead, it becomes a stop codon that signals translation termination in a protein. This is an example of a

Accepted Answer

A)   nonsense mutation.
B)   gross mutation.
C)   missense mutation.
D)   silent mutation.
E)   frameshift mutation.F) None of the above
G) B) and E)

Question 10

"Jumping genes" that can move from one location to another in an organism's genome are called .

Accepted Answer

The answer of "Jumping genes" that can move from one...

Question 11

In generalized transduction, viruses carry random DNA sequences from one cell to another.

Accepted Answer

A) True 
 B)False

Question 12

A(n) is a specific sequence of nucleotides that codes for a protein or an RNA molecule.

Accepted Answer

The answer of A(n) is a specific sequence of nucleotides...

Question 13

Tightly packed regions of a eukaryotic chromosome are called .

Accepted Answer

The answer of Tightly packed regions of a eukaryotic chromosome...

Question 14

Another term for the palindromic sequence found at the ends of transposons is a(n)

Accepted Answer

A)   transposase.
B)   inverted repeat.
C)   complex transposon.
D)   bacteriophage.
E)   insertion sequence.F) C) and D)
G) A) and C)

Question 15

Most bacteria have a natural ability to take up DNA from their environment.

Accepted Answer

A) True 
 B)False

Question 16

Semiconservative DNA replication means that

Accepted Answer

A)   the sequence of a DNA molecule is preserved as it is being replicated.
B)   each daughter DNA molecule is composed of one original strand and one new strand.
C)   each strand of a double- stranded DNA molecule is replicated differently.
D)   nucleotides are constantly being recycled as cells make DNA.
E)   the cell can proofread its newly synthesized DNA part of the time.F) B) and C)
G) A) and C)

Question 17

Bidirectional replication means that each strand of a DNA molecule is replicated in the opposite direction from the other.

Accepted Answer

A) True 
 B)False

Question 18

All of the following are characteristics of Okazaki fragments EXCEPT:

Accepted Answer

A)   they make up the lagging strand of replicated DNA.
B)   they are joined together by DNA ligase.
C)   they begin with an RNA primer.
D)   they are longer in eukaryotic cells.
E)   they are checked for accuracy by DNA polymerase III.F) A) and B)
G) None of the above

Question 19

In addition to coding for the amino acid methionine, what function does the codon AUG serve?

Accepted Answer

A)   start signal
B)   recognition site for RNA polymerase
C)   marker for introns
D)   causes "wobble"
E)   termination signalF) A) and C)
G) C) and E)

Question 20

DNA, which is positively charged, wraps around negatively charged histones as part of the packaging of eukaryotic chromosomes.

Accepted Answer

A) True 
 B)False

Exam 7: Microbial Genetics

Which of the following must be removed from an mRNA molecule before it can be translated in eukaryotes?

Correct AnswerverifiedShow Answer

Why is Taq polymerase used in PCR?

Correct AnswerverifiedShow Answer

"Jumping genes" that can move from one location to another in an organism's genome are called .

Correct AnswerverifiedShow Answer

DNA, which is positively charged, wraps around negatively charged histones as part of the packaging of eukaryotic chromosomes.

Correct AnswerverifiedShow Answer

Semiconservative DNA replication means that

Correct AnswerverifiedShow Answer

All of the following statements concerning transcription in bacteria are true EXCEPT:

Correct AnswerverifiedShow Answer

All of the following are characteristics of Okazaki fragments EXCEPT:

Correct AnswerverifiedShow Answer

If the codon AAA is changed to UAA, it no longer codes for an amino acid; instead, it becomes a stop codon that signals translation termination in a protein. This is an example of a

Correct AnswerverifiedShow Answer

Bidirectional replication means that each strand of a DNA molecule is replicated in the opposite direction from the other.

Correct AnswerverifiedShow Answer

During translation, an mRNA codon will pass through which of the following sequences of tRNA binding sites on the ribosome?

Correct AnswerverifiedShow Answer

Which of the following is a DNA repair enzyme activated by visible light?

Correct AnswerverifiedShow Answer

Which of the following is classified as a frameshift mutagen?

Correct AnswerverifiedShow Answer

A(n) is a specific sequence of nucleotides that codes for a protein or an RNA molecule.

Correct AnswerverifiedShow Answer

In generalized transduction, viruses carry random DNA sequences from one cell to another.

Correct AnswerverifiedShow Answer

Tightly packed regions of a eukaryotic chromosome are called .

Correct AnswerverifiedShow Answer

In addition to coding for the amino acid methionine, what function does the codon AUG serve?

Correct AnswerverifiedShow Answer

The point at which a DNA double helix is "unzipped" is the .

Correct AnswerverifiedShow Answer

In conjugation, F+cells

Correct AnswerverifiedShow Answer

Most bacteria have a natural ability to take up DNA from their environment.

Correct AnswerverifiedShow Answer

Another term for the palindromic sequence found at the ends of transposons is a(n)

Correct AnswerverifiedShow Answer

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