Question 1

A super repressor mutation (IS) results in:

Accepted Answer

A)  no transcription.
B)  inducible transcription.
C)  transcription but no translation.
D)  no translation.
E)  constitutive transcription.F) A) and D)
G) A) and E)

Question 2

A partial diploid of genotype I+ P+ O+ Z+ Y- / I+ P- O+ Z+ Y+ will show:

Accepted Answer

A)  inducible production of  β\betaβ -galactosidase.
B)  inducible production of  β\betaβ -galactosidase and permease.
C)  constitutive production of  β\betaβ -galactosidase.
D)  constitutive production of  β\betaβ -galactosidase and permease.
E)  no  β\betaβ -galactosidase or acetylase production at all. F) A) and B)
G) A) and C)

Question 3

Which of the following is an example of a cis-acting element?

Accepted Answer

A)   β\betaβ -galactosidase
B)  operator site
C)  lacI repressor protein
D)  lactose
E)  permease F) All of the above
G) A) and E)

Question 4

Gene regulation in bacteria and bacteriophage utilize the following terminology.Twelve terms are given below (a - l) , followed by twelve statements.Write the letter of the correct term.A single letter is sufficient.Not all letters need be used.Some letters may be used more than once.
Term List
-phenotype of trp R+ O+ S+ in the presence of tryptophan

Accepted Answer

A)  temporal control
B)  positive control
C)  negative control
D)  inducible
E)  noninducibleF) repressibleG) constitutiveH) operatorI) repressorJ) effector moleculeK) feedback inhibitionL) suppressor mutationM) C) and K)
N) C) and E)

Question 5

In the presence of abundant tryptophan:

Accepted Answer

A)  the attenuator stem-loop structure forms,allowing transcription to continue.
B)  the attenuator stem-loop structure forms,terminating transcription.
C)  the preemptor stem-loop structure forms,allowing transcription to continue.
D)  the preemptor stem-loop structure forms,terminating transcription.
E)  None of the answer options are correct.F) B) and D)
G) D) and E)

Question 6

RNA polymerase binds to the promoter and transcribes the ara operon.In the presence of arabinose,both the CAP-cAMP complex and the AraC-arabinose complex must bind to:

Accepted Answer

A)  araO.
B)  araI.
C)  araA.
D)  araB.
E)  araD.F) C) and D)
G) All of the above B

Question 7

Consider an E.coli cell with the following mutations.What effect would each mutation have on the function of the lac operon (assuming no glucose is present)?
a)a mutant lac operator that cannot bind repressor
b)a mutant lac repressor that cannot bind the lac operator
c)a mutant lac repressor that cannot bind to allolactose
d)a mutant lac promoter that cannot bind CAP plus cAMP

Accepted Answer

a)The lac operon would always be turned ...

Question 8

In the presence of the repressor molecule and free tryptophan,the trp operon is:

Accepted Answer

A)  constitutively transcribed.
B)  derepressed.
C)  induced.
D)  repressed.
E)  transcribed but not translated.F) C) and D)
G) A) and D) D

Question 9

The enzyme  β\betaβ -galactosidase can convert the disaccharide lactose into:

Accepted Answer

A)  allolactose.
B)  glucose.
C)  allolactose and glucose.
D)  allolactose,glucose,and galactose.
E)  sucrose and glucose. F) D) and E)
G) A) and B)

Question 10

A prokaryotic operon is composed of a series of adjacent genes under the control of:

Accepted Answer

A)  the same promoter.
B)  the same operator.
C)  an inducible promoter.
D)  the same operator and promoter.
E)  None of the answer options are correct.F) A) and D)
G) A) and E)

Question 11

The repression of the transcription of lactose-metabolizing genes in the presence of glucose is an example of:

Accepted Answer

A)  catabolite induction.
B)  anabolite induction.
C)  anabolite repression.
D)  catabolite repression.
E)  None of the answer options are correct.F) C) and E)
G) B) and E)

Question 12

Which of the following is an example of a trans-acting factor?

Accepted Answer

A)   β\betaβ -galactosidase
B)  operator site
C)  lacI repressor protein
D)  lactose
E)  permease F) A) and D)
G) A) and E)

Question 13

Gene regulation in bacteria and bacteriophage utilize the following terminology.Twelve terms are given below (a - l) , followed by twelve statements.Write the letter of the correct term.A single letter is sufficient.Not all letters need be used.Some letters may be used more than once.
Term List
-type of operons responding to catabolite repression (glucose effect)

Accepted Answer

A)  temporal control
B)  positive control
C)  negative control
D)  inducible
E)  noninducibleF) repressibleG) constitutiveH) operatorI) repressorJ) effector moleculeK) feedback inhibitionL) suppressor mutationM) B) and G)
N) A) and I)

Question 14

Which of the following is/are NOT part of the trp operon?

Accepted Answer

A)  trpR
B)  trpE
C)  trpC
D)  trpA
E)  All (trpR,trpE,trpC,and trp
A)  are part of the trp operon.F) A) and E)
G) C) and E)

Question 15

Under conditions where tryptophan is scarce:

Accepted Answer

A)  the attenuator stem-loop structure forms,allowing transcription to continue.
B)  the attenuator stem-loop structure forms,terminating transcription.
C)  the preemptor stem-loop structure forms,allowing transcription to continue.
D)  the preemptor stem-loop structure forms,terminating transcription.
E)  None of the answer options are correct.F) A) and D)
G) D) and E)

Question 16

The order of the structural genes controlling the trp operon is:

Accepted Answer

A)  trpE,trpD,trpC,trpB,trpA.
B)  trpA,trpC,trpB,trpD,trpE.
C)  trpE,trpD,trpC,trpA trpB.
D)  trpA,trpB,trpC,trpD,trpE.
E)  None of the answer options are correct.F) C) and D)
G) A) and C)

Question 17

In Bacillus,the presence of alternate forms of which molecule is responsible for the control of large numbers of genes?

Accepted Answer

A)  DNA dependent RNA polymerase
B)  TFII
C)  σ factor
D)  Trp repressor
E)  Operator proteinF) D) and E)
G) A) and B)

Question 18

Gene regulation in bacteria and bacteriophage utilize the following terminology.Twelve terms are given below (a - l) , followed by twelve statements.Write the letter of the correct term.A single letter is sufficient.Not all letters need be used.Some letters may be used more than once.
Term List
-small molecules that bind to regulatory molecule,such as repressor

Accepted Answer

A)  temporal control
B)  positive control
C)  negative control
D)  inducible
E)  noninducibleF) repressibleG) constitutiveH) operatorI) repressorJ) effector moleculeK) feedback inhibitionL) suppressor mutationM) I) and J)
N) A) and I) J

Question 19

A constitutive operator mutation (Oc) results in:

Accepted Answer

A)  no transcription.
B)  inducible transcription.
C)  transcription but no translation.
D)  no translation.
E)  constitutive transcription.F) B) and D)
G) B) and E)

Question 20

Which of the following DNA-binding proteins contain a helix-turn-helix domain?

Accepted Answer

A)  LacI repressor
B)  TrpR repressor
C)  AraC activator
D)   λ\lambdaλ  and Cro repressor
E)  All of the answer options are correct. F) A) and B)
G) All of the above

Exam 11: Regulation of Gene Expression in Bacteria and Their Viruses

A super repressor mutation (I^S) results in:

Correct Answer
verified

A partial diploid of genotype I⁺P⁺ O⁺ Z⁺ Y^- / I⁺ P^-O⁺ Z⁺ Y⁺will show:

Correct Answer
verified

Which of the following is an example of a cis-acting element?

Correct Answer
verified

Correct Answer
verified

In the presence of abundant tryptophan:

Correct Answer
verified

RNA polymerase binds to the promoter and transcribes the ara operon.In the presence of arabinose,both the CAP-cAMP complex and the AraC-arabinose complex must bind to:

Correct Answer
verified
B

Correct Answer
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a)The lac operon would always be turned ...
View Answer

In the presence of the repressor molecule and free tryptophan,the trp operon is:

Correct Answer
verified
D

The enzyme $\beta$ -galactosidase can convert the disaccharide lactose into:

Correct Answer
verified

A prokaryotic operon is composed of a series of adjacent genes under the control of:

Correct Answer
verified

The repression of the transcription of lactose-metabolizing genes in the presence of glucose is an example of:

Correct Answer
verified

Which of the following is an example of a trans-acting factor?

Correct Answer
verified

Correct Answer
verified

Which of the following is/are NOT part of the trp operon?

Correct Answer
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Under conditions where tryptophan is scarce:

Correct Answer
verified

The order of the structural genes controlling the trp operon is:

Correct Answer
verified

In Bacillus,the presence of alternate forms of which molecule is responsible for the control of large numbers of genes?

Correct Answer
verified

Correct Answer
verified
J

A constitutive operator mutation (O^c) results in:

Correct Answer
verified

Which of the following DNA-binding proteins contain a helix-turn-helix domain?

Correct Answer
verified

Exam 11: Regulation of Gene Expression in Bacteria and Their Viruses

A super repressor mutation (IS) results in:

Correct AnswerverifiedShow Answer

A partial diploid of genotype I+ P+ O+ Z+ Y- / I+ P- O+ Z+ Y+ will show:

Correct AnswerverifiedShow Answer

Which of the following is an example of a cis-acting element?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In the presence of abundant tryptophan:

Correct AnswerverifiedShow Answer

RNA polymerase binds to the promoter and transcribes the ara operon.In the presence of arabinose,both the CAP-cAMP complex and the AraC-arabinose complex must bind to:

Correct AnswerverifiedB

Correct Answerverifieda)The lac operon would always be turned ...View AnswerShow Answer

In the presence of the repressor molecule and free tryptophan,the trp operon is:

Correct AnswerverifiedD

The enzyme β\betaβ -galactosidase can convert the disaccharide lactose into:

Correct AnswerverifiedShow Answer

A prokaryotic operon is composed of a series of adjacent genes under the control of:

Correct AnswerverifiedShow Answer

The repression of the transcription of lactose-metabolizing genes in the presence of glucose is an example of:

Correct AnswerverifiedShow Answer

Which of the following is an example of a trans-acting factor?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is/are NOT part of the trp operon?

Correct AnswerverifiedShow Answer

Under conditions where tryptophan is scarce:

Correct AnswerverifiedShow Answer

The order of the structural genes controlling the trp operon is:

Correct AnswerverifiedShow Answer

In Bacillus,the presence of alternate forms of which molecule is responsible for the control of large numbers of genes?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedJ

A constitutive operator mutation (Oc) results in:

Correct AnswerverifiedShow Answer

Which of the following DNA-binding proteins contain a helix-turn-helix domain?

Correct AnswerverifiedShow Answer

A super repressor mutation (I^S) results in:

Correct Answer
verified

A partial diploid of genotype I⁺P⁺ O⁺ Z⁺ Y^- / I⁺ P^-O⁺ Z⁺ Y⁺will show:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified
a)The lac operon would always be turned ...
View Answer

Correct Answer
verified
D

The enzyme $\beta$ -galactosidase can convert the disaccharide lactose into:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
J

A constitutive operator mutation (O^c) results in:

Correct Answer
verified

Correct Answer
verified