Question 1

A collection of genes or operons controlled by a common regulatory protein is called a(n) ___________ .

Accepted Answer

The answer of A collection of genes or operons controlled...

Question 2

When a repressor binds to the operator site on the DNA it normally

Accepted Answer

A)   inhibits the initiation of transcription.
B)   reduces the rate of transcription.
C)   terminates transcription that has already been initiated.
D)   has no effect on transcription.E) All of the above
F) B) and C)

Question 3

The

Accepted Answer

A)   one
B)   two
C)   three
D)   four
E)   coli lac operon has ________ operator sequences.F) D) and E)
G) C) and D)

Question 4

So-called two-component regulatory systems

Accepted Answer

A)   include a sensor kinase and a response regulator.
B)   play a key role in regulating sporulation in Bacillus.
C)   play a key role in regulating the OmpF and OmpC porin proteins in
D)   all of the choices
E)   coli.F) B) and E)
G) D) and E) D

Question 5

Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli?

Accepted Answer

A)   repression
B)   catabolite repression
C)   attenuation
D)   all of the choicesE) A) and C)
F) A) and D)

Question 6

The sensor kinase for the OmpF: OmpC two-component regulatory system is

Accepted Answer

A)   the OmpK protein.
B)   the EnvZ protein.
C)   the MicF RNA.
D)   none of the choices.E) A) and D)
F) B) and C) B

Question 7

The standard or housekeeping sigma factor used most often by

Accepted Answer

A)   70
B)   32
C)   S
D)   E
E)   coli RNA polymerase under normal growth conditions is called sigma ___.F) B) and D)
G) A) and B)

Question 8

Cell-to-cell communication by quorum sensing has been shown to be important in the regulation of genes needed for

Accepted Answer

A)   virulence.
B)   biofilm production.
C)   plasmid transfer.
D)   all of the choices.E) None of the above
F) All of the above

Question 9

The binding of arabinose to the AraC protein allows it to form a loop in the DNA upstream of the ara operon promoter.

Accepted Answer

A) True 
 B)False  False

Question 10

____________ is used to measure the amount of a chemoattractant encountered over time.

Accepted Answer

The answer of ____________ is used to measure the amount...

Question 11

Most

Accepted Answer

A)   CAP
B)   MicF
C)   Hfq
D)   none of the choices
E)   coli antisense RNAs work with a protein called ______ to regulate their target mRNAs.F) A) and D)
G) A) and E)

Question 12

During sporulation in Bacillus subtilis, the response regulator that positively controls many genes needed for sporulation and negatively controls genes not needed during sporulation is

Accepted Answer

A)   SpoOB
B)   SpoOA
C)   SpoOF
D)   SpoOCE) None of the above
F) C) and D)

Question 13

During the early stages of sporulation in Bacillus subtilis, ________ is active in the forespore and ________ is active in the mother cell.

Accepted Answer

A)    σ\sigmaσ E;  σ\sigmaσ F
B)    σ\sigmaσ K;  σ\sigmaσ F
C)    σ\sigmaσ F;  σ\sigmaσ K
D)    σ\sigmaσ F;  σ\sigmaσ E E) B) and C)
F) A) and D)

Question 14

Bacteria, Archaea, and Eukarya differ in both their genome structure as well as in the steps required to complete gene expression.

Accepted Answer

A) True 
 B)False

Question 15

Riboswitches that can block the initiation of translation because of a conformational change that occurs in the leader sequence of an mRNA when the appropriate regulatory effector binds the mRNA achieve that blockage of translation initiation by the occlusion of

Accepted Answer

A)   the promoter
B)   the attenuator
C)   the Shine-Delgarno sequence
D)   the AUG start codonE) None of the above
F) A) and D)

Question 16

When bound to the DNA, the repressor protein usually prevents attachment of the RNA polymerase to the __________.

Accepted Answer

A)   operon
B)   operator
C)   promoter
D)   regulatorE) A) and C)
F) A) and B)

Question 17

Posttranslational regulation occurs after a protein has been synthesized, and can occur by

Accepted Answer

A)   allosteric control
B)   feedback inhibition
C)   covalent modification
D)   allosteric control and covalent modification are both means of regulation after translation is completeE) A) and B)
F) A) and C)

Question 18

Regulation of gene expression serves to do all of the following except

Accepted Answer

A)   conserve energy and raw materials
B)   maintain balance between the amounts of various cell proteins
C)   adjust the activity of existing proteins in the cell
D)   adapt to long-term environmental changeE) All of the above
F) B) and C)

Question 19

Two-component signal transduction systems are found in the Bacteria, but not in Archaea.

Accepted Answer

A) True 
 B)False

Question 20

The site on the DNA to which a repressor protein binds is the __________.

Accepted Answer

A)   operon
B)   operator
C)   promoter
D)   regulatorE) None of the above
F) All of the above

Exam 13: Microbial Genetics Regulation of Gene Expression

A collection of genes or operons controlled by a common regulatory protein is called a(n) ___________ .

Correct AnswerverifiedShow Answer

When a repressor binds to the operator site on the DNA it normally

Correct AnswerverifiedShow Answer

The

Correct AnswerverifiedShow Answer

So-called two-component regulatory systems

Correct AnswerverifiedD

Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli?

Correct AnswerverifiedShow Answer

The sensor kinase for the OmpF: OmpC two-component regulatory system is

Correct AnswerverifiedB

The standard or housekeeping sigma factor used most often by

Correct AnswerverifiedShow Answer

Cell-to-cell communication by quorum sensing has been shown to be important in the regulation of genes needed for

Correct AnswerverifiedShow Answer

The binding of arabinose to the AraC protein allows it to form a loop in the DNA upstream of the ara operon promoter.

Correct AnswerverifiedFalse

____________ is used to measure the amount of a chemoattractant encountered over time.

Correct AnswerverifiedShow Answer

Most

Correct AnswerverifiedShow Answer

During sporulation in Bacillus subtilis, the response regulator that positively controls many genes needed for sporulation and negatively controls genes not needed during sporulation is

Correct AnswerverifiedShow Answer

During the early stages of sporulation in Bacillus subtilis, ________ is active in the forespore and ________ is active in the mother cell.

Correct AnswerverifiedShow Answer

Bacteria, Archaea, and Eukarya differ in both their genome structure as well as in the steps required to complete gene expression.

Correct AnswerverifiedShow Answer

Riboswitches that can block the initiation of translation because of a conformational change that occurs in the leader sequence of an mRNA when the appropriate regulatory effector binds the mRNA achieve that blockage of translation initiation by the occlusion of

Correct AnswerverifiedShow Answer

When bound to the DNA, the repressor protein usually prevents attachment of the RNA polymerase to the __________.

Correct AnswerverifiedShow Answer

Posttranslational regulation occurs after a protein has been synthesized, and can occur by

Correct AnswerverifiedShow Answer

Regulation of gene expression serves to do all of the following except

Correct AnswerverifiedShow Answer

Two-component signal transduction systems are found in the Bacteria, but not in Archaea.

Correct AnswerverifiedShow Answer

The site on the DNA to which a repressor protein binds is the __________.

Correct AnswerverifiedShow Answer

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During the early stages of sporulation in Bacillus subtilis, is active in the forespore and is active in the mother cell.

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