Question 1

Which is false regarding the two-component regulatory system in bacteria?

Accepted Answer

A)  The system involves a sensor kinase and a response regulator.
B)  The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes.
C)  Regulation of OmpF and OmpC porin proteins in
D)  One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm.
E)  coli is modulated by this type of system.F) C) and E)
G) A) and C)

Question 2

In terms of global gene regulation,which of the following molecules is most similar to c-di-GMP and cAMP?

Accepted Answer

A)  ppGpp
B)  rRNA
C)  ATP
D)  EnvZE) A) and B)
F) None of the above A

Question 3

In which situation might methylation of membrane proteins in Escherichia coli initiate a phosphorelay system that evokes clockwise rotation of flagella?

Accepted Answer

A)  Presence of a chemorepellent in the extracellular environment.
B)  Change in environmental osmotic pressure.
C)  Utilization of lactose due during diauxic growth.
D)  Cellular population reaches a quorum.E) A) and B)
F) None of the above

Question 4

If a set of genes is repressed in the presence of the controlling substance,it is referred to as __________ control.

Accepted Answer

The answer of If a set of genes is repressed...

Question 5

What term describes a set of genes that is controlled by a common regulatory protein?

Accepted Answer

A)  Codon
B)  Regulon
C)  Transcription
D)  KinaseE) B) and C)
F) A) and D)

Question 6

Which of the following is an example of gene regulation at the posttranslational level?

Accepted Answer

A)  Alteration of protein structure
B)  Early termination of an mRNA transcript
C)  Initiation of protein synthesis
D)  Prevention of RNA synthesisE) A) and B)
F) A) and C)

Question 7

Guanine tetraphosphate (ppGpp) is particularly associated with which process?

Accepted Answer

A)  Spore formation in Bacillus
B)  Chemiosmosis in Paracoccus
C)  Stringent response in Escherichia
D)  Quorum sensing in VibrioE) C) and D)
F) A) and D)

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

Acylhomoserine lactones used in quorum sensing regulate their own synthesis by a(n) ____________ system.

Accepted Answer

A)  riboswitch
B)  antisense
C)  catabolite repression
D)  autoinductionE) C) and D)
F) B) and D) D

Question 10

The

Accepted Answer

A)  one
B)  two
C)  three
D)  four
E)  coli lac operon has ________ operator sequences.F) None of the above
G) B) and C)

Question 11

If autophosphorylation of CheA protein does not occur,then Escherichia coli cells must be

Accepted Answer

A)  in a gradient of a chemoattractant.
B)  in a gradient of a chemorepellant.
C)  tumbling.
D)  rotating flagella clockwise.E) C) and D)
F) None of the above

Question 12

In catabolite repression systems of some Gram-positive bacteria,such as Bacillus subtilis,transcription of catabolic operons is regulated by CcpaA (catabolite control protein A) rather than cAMP.Propose a hypothesis to explain the preferential use of glucose in the presence of a second sugar such as sucrose by Bacillus subtilis.

Accepted Answer

A)  CcpaA acts as a repressor of sucrose operon genes in Bacillus subtilis when both sugars are present.
B)  CcpaA acts as an inducer of sucrose operon genes in Bacillus subtilis when both sugars are present.
C)  CcpaA acts as a repressor of sucrose operon genes in Bacillus subtilis when lactose,but not glucose,is present.
D)  CcpaA acts as an inducer of sucrose operon genes in Bacillus subtilis when glucose,but not lactose,is present.E) All of the above
F) A) and B)

Question 13

The activity of adenyl cyclase is influenced by

Accepted Answer

A)  the phosphotransferase system.
B)  the presence of lactose in the environment.
C)  homoserine lactones.
D)  None of the choices are correct.E) A) and B)
F) A) and D) A

Question 14

Scientists first focused on gene regulation at the level of translation,rather than transcription,because more was known about protein than nucleic acids at the time.

Accepted Answer

A) True 
 B)False

Question 15

In some circumstances,when two different carbon sources are available,growth will occur first using one carbon source,then after a short lag period,growth will resume using the second carbon source.This process is called __________ growth.

Accepted Answer

A)  alternating
B)  bimorphic
C)  diauxic
D)  dimorphicE) A) and B)
F) B) and D)

Question 16

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) All of the above
F) None of the above

Question 17

Riboswitches regulate transcription,rather than translation,in cells.

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

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

Question 19

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) C) and D)
F) None of the above

Question 20

Small RNAs that regulate translation by binding to the leader region of mRNAs are called antisense RNAs.

Accepted Answer

A) True 
 B)False

Exam 14: Regulation of Bacterial Cellular Processes

Which is false regarding the two-component regulatory system in bacteria?

Correct Answer
verified

In terms of global gene regulation,which of the following molecules is most similar to c-di-GMP and cAMP?

Correct Answer
verified
A

In which situation might methylation of membrane proteins in Escherichia coli initiate a phosphorelay system that evokes clockwise rotation of flagella?

Correct Answer
verified

If a set of genes is repressed in the presence of the controlling substance,it is referred to as __________ control.

Correct Answer
verified

What term describes a set of genes that is controlled by a common regulatory protein?

Correct Answer
verified

Which of the following is an example of gene regulation at the posttranslational level?

Correct Answer
verified

Guanine tetraphosphate (ppGpp) is particularly associated with which process?

Correct Answer
verified

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

Correct Answer
verified

Acylhomoserine lactones used in quorum sensing regulate their own synthesis by a(n) ____________ system.

Correct Answer
verified
D

The

Correct Answer
verified

If autophosphorylation of CheA protein does not occur,then Escherichia coli cells must be

Correct Answer
verified

Correct Answer
verified

The activity of adenyl cyclase is influenced by

Correct Answer
verified
A

Scientists first focused on gene regulation at the level of translation,rather than transcription,because more was known about protein than nucleic acids at the time.

Correct Answer
verified

In some circumstances,when two different carbon sources are available,growth will occur first using one carbon source,then after a short lag period,growth will resume using the second carbon source.This process is called __________ growth.

Correct Answer
verified

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

Correct Answer
verified

Riboswitches regulate transcription,rather than translation,in cells.

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Small RNAs that regulate translation by binding to the leader region of mRNAs are called antisense RNAs.

Correct Answer
verified

Exam 14: Regulation of Bacterial Cellular Processes

Which is false regarding the two-component regulatory system in bacteria?

Correct AnswerverifiedShow Answer

In terms of global gene regulation,which of the following molecules is most similar to c-di-GMP and cAMP?

Correct AnswerverifiedA

In which situation might methylation of membrane proteins in Escherichia coli initiate a phosphorelay system that evokes clockwise rotation of flagella?

Correct AnswerverifiedShow Answer

If a set of genes is repressed in the presence of the controlling substance,it is referred to as __________ control.

Correct AnswerverifiedShow Answer

What term describes a set of genes that is controlled by a common regulatory protein?

Correct AnswerverifiedShow Answer

Which of the following is an example of gene regulation at the posttranslational level?

Correct AnswerverifiedShow Answer

Guanine tetraphosphate (ppGpp) is particularly associated with which process?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Acylhomoserine lactones used in quorum sensing regulate their own synthesis by a(n) ____________ system.

Correct AnswerverifiedD

The

Correct AnswerverifiedShow Answer

If autophosphorylation of CheA protein does not occur,then Escherichia coli cells must be

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The activity of adenyl cyclase is influenced by

Correct AnswerverifiedA

Scientists first focused on gene regulation at the level of translation,rather than transcription,because more was known about protein than nucleic acids at the time.

Correct AnswerverifiedShow Answer

In some circumstances,when two different carbon sources are available,growth will occur first using one carbon source,then after a short lag period,growth will resume using the second carbon source.This process is called __________ growth.

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

Riboswitches regulate transcription,rather than translation,in cells.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Small RNAs that regulate translation by binding to the leader region of mRNAs are called antisense RNAs.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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A

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Correct Answer
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D

Correct Answer
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A

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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