Question 1

A nucleosome is a linear chromosome wound around the

Accepted Answer

A)  nuclear membrane.
B)  rRNA.
C)  mRNA.
D)  histone.
E)  nucleolus.F) C) and D)
G) B) and C)

Question 2

Helicase

Accepted Answer

A)  unwinds DNA.
B)  supercoils DNA.
C)  unwinds RNA.
D)  winds RNA.E) A) and D)
F) C) and D)

Question 3

The enzyme that can proofread replicating DNA,detect incorrect bases,excise them,and correctly replace them is

Accepted Answer

A)  DNA ligase.
B)  DNA polymerase.
C)  DNA helicase.
D)  DNA gyrase.
E)  primase.F) None of the above
G) A) and C)

Question 4

The development of virulent,toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of:

Accepted Answer

A)  bacterial conjugation.
B)  transformation.
C)  generalized transduction.
D)  specialized transduction.E) None of the above
F) B) and D)

Question 5

A bacteriophage transfers a random fragment of DNA of the previous host to the current host.This is an example of

Accepted Answer

A)  conjugation.
B)  generalized transduction.
C)  specialized transduction.
D)  creation of an Hfr cell.E) B) and C)
F) C) and D)

Question 6

All of the following pertain to nitrogenous bases except

Accepted Answer

A)  form pairs by hydrogen bonding.
B)  guanine pairs with uracil.
C)  adenine pairs with thymine.
D)  cytosine and thymine are pyrimidines.
E)  allows variation from one nucleotide to another which creates the encoded information.F) A) and B)
G) B) and D) B

Question 7

Full induction of the lactose operon requires

Accepted Answer

A)  lactose present.
B)  lactose and glucose present.
C)  lactose present without glucose.
D)  lactose and arabinose present.E) None of the above
F) A) and C)

Question 8

DNA gyrase

Accepted Answer

A)  unwinds DNA.
B)  supercoils DNA.
C)  cleaves DNA.
D)  joins free DNA ends.E) A) and C)
F) B) and C)

Question 9

This molecule is translated into an amino acid sequence:

Accepted Answer

A)  ribosomal RNA
B)  messenger RNA
C)  transfer RNA
D)  primer RNA
E)  ribozymesF) D) and E)
G) B) and D)

Question 10

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the

Accepted Answer

A)  promoter.
B)  operator.
C)  operon.
D)  exon.
E)  intron.F) C) and D)
G) C) and E)

Question 11

DNA Polymerase III

Accepted Answer

A)  synthesizes primer.
B)  removes primer.
C)  joins Okazaki fragments.
D)  unzips the DNA helix.
E)  proofreads new DNA.F) B) and D)
G) None of the above

Question 12

Transcription occurs within the nucleus or at the nucleoid.

Accepted Answer

A) True 
 B)False  True

Question 13

A primer comprised of ____ is needed at the origin of nucleotide addition.

Accepted Answer

A)  polymerase III
B)  polymerase I
C)  helicase
D)  RNA
E)  DNAF) C) and E)
G) None of the above

Question 14

Looking at your results of the Ames test,using bacteriological agar medium plates lacking the amino acid histidine,you find that there are many colonies growing on the agar.Your interpretation of this result is:

Accepted Answer

A)  the bacterium has turned its operon genes on,producing proteins necessary for growth.
B)  the chemical being tested is mutagenic.
C)  the bacterium does not have any plasmids,so it cannot grow on the medium.
D)  the drug being tested has no inhibitory effect on the bacterium,therefore it is not a good antibiotic to give for treatment of disease.E) A) and C)
F) A) and B)

Question 15

The duplication of a cell's DNA is called

Accepted Answer

A)  mitosis.
B)  replication.
C)  transcription.
D)  translation.
E)  mutation.F) C) and D)
G) A) and B)

Question 16

Synthesis of an inducible enzyme requires

Accepted Answer

A)  repressor alone bound to operator.
B)  substrate bound to repressor.
C)  substrate bound to promoter.
D)  corepressor and repressor binding to operator.E) B) and D)
F) B) and C)

Question 17

A permanent,inheritable change in the genetic information is called a/n

Accepted Answer

A)  translation.
B)  transcription.
C)  mutation.
D)  alteration.
E)  regeneration.F) C) and E)
G) B) and C)

Question 18

Which of the following is not a type of microRNA?

Accepted Answer

A)  tRNA
B)  miRNA
C)  antisense RNA
D)  riboswitch
E)  siRNAF) A) and B)
G) A) and E)

Question 19

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is

Accepted Answer

A)  DNA ligase.
B)  DNA polymerase.
C)  DNA helicase.
D)  DNA gyrase.
E)  primase.F) A) and C)
G) D) and E) D

Question 20

Semiconservative replication refers to

Accepted Answer

A)  each base bonding at the 1' position of the sugar.
B)  a purine always bonding to a pyrimidine.
C)  one helix strand that runs from the 5' to 3' direction and the other strand that runs from the 3' to 5' direction.
D)  an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.E) A) and D)
F) A) and C)

Exam 9: Microbial Genetics

A nucleosome is a linear chromosome wound around the

Correct AnswerverifiedShow Answer

Helicase

Correct AnswerverifiedShow Answer

The enzyme that can proofread replicating DNA,detect incorrect bases,excise them,and correctly replace them is

Correct AnswerverifiedShow Answer

The development of virulent,toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of:

Correct AnswerverifiedShow Answer

A bacteriophage transfers a random fragment of DNA of the previous host to the current host.This is an example of

Correct AnswerverifiedShow Answer

All of the following pertain to nitrogenous bases except

Correct AnswerverifiedB

Full induction of the lactose operon requires

Correct AnswerverifiedShow Answer

DNA gyrase

Correct AnswerverifiedShow Answer

This molecule is translated into an amino acid sequence:

Correct AnswerverifiedShow Answer

The nontranscribed region of DNA to which RNA polymerase binds to initiate transcription is called the

Correct AnswerverifiedShow Answer

DNA Polymerase III

Correct AnswerverifiedShow Answer

Transcription occurs within the nucleus or at the nucleoid.

Correct AnswerverifiedTrue

A primer comprised of ____ is needed at the origin of nucleotide addition.

Correct AnswerverifiedShow Answer

Looking at your results of the Ames test,using bacteriological agar medium plates lacking the amino acid histidine,you find that there are many colonies growing on the agar.Your interpretation of this result is:

Correct AnswerverifiedShow Answer

The duplication of a cell's DNA is called

Correct AnswerverifiedShow Answer

Synthesis of an inducible enzyme requires

Correct AnswerverifiedShow Answer

A permanent,inheritable change in the genetic information is called a/n

Correct AnswerverifiedShow Answer

Which of the following is not a type of microRNA?

Correct AnswerverifiedShow Answer

The enzyme that helps pack DNA into the cell by coiling the DNA into a tight bundle is

Correct AnswerverifiedD

Semiconservative replication refers to

Correct AnswerverifiedShow Answer

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B

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True

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D

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