Question 1

Which of the following events occurs initially when Escherichia coli cells are in a gradient of a chemorepellent?

Accepted Answer

A)  CheA autophosphorylates
B)  Flagella rotate clockwise
C)  Cells tumble
D)  CheY is phorphorylatedE) C) and D)
F) A) and C)

Question 2

What is the function of cyclic dimeric GMP in bacterial global regulation systems?

Accepted Answer

A)  It acts as a secondary nucleotide messenger.
B)  It is a sensor kinase.
C)  It converts GTP to cGTP.
D)  It is an autoinducer.E) None of the above
F) A) and B)

Question 3

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

Accepted Answer

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

Question 4

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 are correct.E) A) and B)
F) None of the above

Question 5

With the

Accepted Answer

A)  the same as
B)  less than
C)  greater than
D)  Repression is not used in the regulation of the
E)  coli trp operon where both repression and attenuation occur,the extent of regulation achieved by repression is _____________ the extent of regulation achieved by attenuation.F) C) and D)
G) B) and C)

Question 6

Helix-turn-helix and zinc fingers are secondary structural motifs in DNA and RNA,respectively.

Accepted Answer

A) True 
 B)False

Question 7

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)  SpoOC.E) None of the above
F) B) and C)

Question 8

Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?

Accepted Answer

A)  Allosteric regulation following transcription of mRNA occurs in many biosynthetic pathways.
B)  Protein synthesis is often repressed by feedback or noncompetitive inhibition.
C)  Covalent modification of newly synthesized proteins generally has no marked effect on protein function.
D)  Once a protein is synthesized,there is little to no postranslational modification.E) B) and C)
F) B) and D)

Question 9

What is the key factor determining whether or not attenuation will occur when transcription of the

Accepted Answer

A)  The activity level of adenyl cyclase
B)  The trp operon repressor
C)  The level of tryptophan in the environment
D)  The level of trp-tRNA that is charged with tryptophan
E)  coli trp operon has been initiated?F) B) and E)
G) B) and D)

Question 10

Enzymes that are expressed at a constant level all the time are said to be .

Accepted Answer

A)  inducible
B)  repressible
C)  constitutive
D)  attenuatedE) C) and D)
F) None of the above

Question 11

Which of the following is not a mechanism of quorum sensing in Vibrio?

Accepted Answer

A)  Phosphorelay
B)  Stringent response
C)  Autoinduction
D)  Antisense RNAsE) A) and B)
F) All of the above

Question 12

The __________ is a factor-independent termination site found in the leader region of certain operons,which,under the influence of ribosome behavior,controls the continued transcription of that operon.

Accepted Answer

A)  modulator
B)  operator
C)  attenuator
D)  terminatorE) A) and D)
F) C) and D)

Question 13

It has been observed that when the sugar source changes in a growth medium,the growth rate of yeast vary widely in response.Some strains of yeast are slow to induce catabolic operons while other strains quickly synthesize proteins to process the new sugar.What might be one explanation for this difference in the growth rate of the strains?

Accepted Answer

A)  Different sugars can act as effector or repressor molecules in various strains,promoting or inhibiting transcription of genes depending on the type of sugar present.
B)  Operons for anabolic pathways are controlled by many global regulatory mechanisms,and different sugars can favor initiation of different pathways depending on the strain of yeast.
C)  All of the choices are correct.
D)  Catabolic repression strategies of operons for using different sugars may vary among strains,thereby favoring initiation of transcription in one strain over another depending on the sugar.E) B) and C)
F) A) and D)

Question 14

When arabinose is present in the environment,the AraC protein acts as a(n)______________ for the
E.coli ara operon.

Accepted Answer

The answer of When arabinose is present in the environment,the...

Question 15

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

Accepted Answer

A)  Induction
B)  Catabolite repression
C)  Attenuation
D)  All of the choices are correct.E) A) and D)
F) B) and C)

Exam 14: Regulation of Bacterial Cellular Processes

When arabinose is present in the environment,the AraC protein acts as a(n)______________ for the E.coli ara operon.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?

Correct Answer
verified

Which of the following is not a mechanism of quorum sensing in Vibrio?

Correct Answer
verified

The __________ is a factor-independent termination site found in the leader region of certain operons,which,under the influence of ribosome behavior,controls the continued transcription of that operon.

Correct Answer
verified

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

Correct Answer
verified

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 Answer
verified

Helix-turn-helix and zinc fingers are secondary structural motifs in DNA and RNA,respectively.

Correct Answer
verified

Enzymes that are expressed at a constant level all the time are said to be .

Correct Answer
verified

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

Correct Answer
verified

With the

Correct Answer
verified

What is the key factor determining whether or not attenuation will occur when transcription of the

Correct Answer
verified

Which of the following events occurs initially when Escherichia coli cells are in a gradient of a chemorepellent?

Correct Answer
verified

What is the function of cyclic dimeric GMP in bacterial global regulation systems?

Correct Answer
verified

Exam 14: Regulation of Bacterial Cellular Processes

When arabinose is present in the environment,the AraC protein acts as a(n)______________ for the E.coli ara operon.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?

Correct AnswerverifiedShow Answer

Which of the following is not a mechanism of quorum sensing in Vibrio?

Correct AnswerverifiedShow Answer

The __________ is a factor-independent termination site found in the leader region of certain operons,which,under the influence of ribosome behavior,controls the continued transcription of that operon.

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

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

Helix-turn-helix and zinc fingers are secondary structural motifs in DNA and RNA,respectively.

Correct AnswerverifiedShow Answer

Enzymes that are expressed at a constant level all the time are said to be .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

With the

Correct AnswerverifiedShow Answer

What is the key factor determining whether or not attenuation will occur when transcription of the

Correct AnswerverifiedShow Answer

Which of the following events occurs initially when Escherichia coli cells are in a gradient of a chemorepellent?

Correct AnswerverifiedShow Answer

What is the function of cyclic dimeric GMP in bacterial global regulation systems?

Correct AnswerverifiedShow Answer

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