Question 1

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

Question 2

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) A) and B)
F) All of the above D

Question 3

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.E) B) and C)
F) A) and C)

Question 4

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) C) and D)

Question 5

In two component regulatory systems,the response regulator typically receives a ____________ from the sensor kinase when it has been activated.

Accepted Answer

A)  pyruvate group
B)  phosphoryl group
C)  acetyl group
D)  methyl groupE) A) and D)
F) C) and D)

Question 6

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 choicesE) A) and B)
F) B) and D)

Question 7

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 B)
F) C) and D)

Question 8

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) D) and E)
G) A) and B)

Question 9

If Escherichia coli is cultured in broth containing both glucose and lactose,it

Accepted Answer

A)  uses glucose preferentially until the supply is exhausted,then uses lactose.
B)  uses lactose preferentially until the supply is exhausted,then uses glucose.
C)  uses glucose and lactose simultaneously.
D)  uses only the glucose (it cannot use lactose as a source of carbon) .E) B) and D)
F) A) and B)

Question 10

The real inducer for the
E.coli lac operon is allolactose produced by the action of permease on lactose.

Accepted Answer

A) True 
 B)False

Question 11

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 12

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 13

______________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.

Accepted Answer

A)  Attenuation
B)  Catabolite repression
C)  Induction
D)  All of the choicesE) A) and D)
F) A) and C)

Question 14

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) All of the above
F) A) and D)

Question 15

An operon network that is under the control of a common regulatory protein while each operon is still also under the control of its own unique regulatory protein is most specifically referred to as a

Accepted Answer

A)  regulon.
B)  webulon.
C)  modulon.
D)  complexon.E) B) and C)
F) A) and B)

Question 16

The terminator versus anti-terminator function of the T box-based riboswitch used by Gram-positive bacteria to regulate amino acid-related genes is determined by

Accepted Answer

A)  the binding of the appropriate uncharged tRNA.
B)  the rate of leader peptide synthesis.
C)  the binding of the T box binding protein.
D)  the utilization of the appropriate sigma factor by RNA polymerase.E) All of the above
F) A) and C)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

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

Accepted Answer

A)  codon
B)  regulon
C)  transcription
D)  operonE) All of the above
F) B) and C) B

Question 19

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) B) and C)
F) C) and D)

Question 20

In the presence of both glucose and lactose,the lactose repressor is not bound to the operator and the genes of the lactose operon are expressed.

Accepted Answer

A) True 
 B)False  False

Exam 14: Regulation of Bacterial Cellular Processes

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

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 AnswerverifiedD

The activity of adenyl cyclase is influenced by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In two component regulatory systems,the response regulator typically receives a ____________ from the sensor kinase when it has been activated.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The standard or housekeeping sigma factor used most often by

Correct AnswerverifiedShow Answer

If Escherichia coli is cultured in broth containing both glucose and lactose,it

Correct AnswerverifiedShow Answer

The real inducer for the E.coli lac operon is allolactose produced by the action of permease on lactose.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

______________ is used to control transcription of some anabolic pathways involved in amino acid biosynthesis.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An operon network that is under the control of a common regulatory protein while each operon is still also under the control of its own unique regulatory protein is most specifically referred to as a

Correct AnswerverifiedShow Answer

The terminator versus anti-terminator function of the T box-based riboswitch used by Gram-positive bacteria to regulate amino acid-related genes is determined by

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

In the presence of both glucose and lactose,the lactose repressor is not bound to the operator and the genes of the lactose operon are expressed.

Correct AnswerverifiedFalse

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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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D

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B

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False