ASU BIO 340 Exam 3
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What will be the effect on transcription
when an inhibitor is in play?
B. Prevent transcription
A. Allow transcription
B. Prevent transcription
What will be the effect on transcription
when an inducer is in play?
A. Allow transcription
A. Allow transcription
B. Prevent transcription
For a gene under positive control, which
of the following would prevent transcrip-
tion?
A. Repressor
Inhibitor
B. Corepressor
C. Inducer
D. Effector
E. Inhibitor
For a gene under negative control, which
of the following would you expect to find
bound to the repressor if there is active
transcription?
C. Inducer
A. Repressor
B. Corepressor
C. Inducer
D. Effector
E. Inhibitor
Which molecule serves as the inducer
for the lac operon?
A. cAMP D. Allolactose
B. Glucose
C. Lactose
D. Allolactose
Which of the following conditions will re-
sult in the greatest levels of transcription
, ASU BIO 340 Exam 3
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of the lac operon?
A. Lactose absent, glucose absent
D. Lactose present, glucose absent
B. Lactose absent, glucose present
C. Lactose present, glucose present
D. Lactose present, glucose absent
Which of the following mutations will re-
sult in the lowest level of transcription of
the lac operon when lactose is present?
A. An operator mutation that prevents
binding of the lac repressor D. A mutation in the lac repressor that
B. A mutation in the lac repressor that prevents it from binding allolactose
prevents it from binding to the operator
C. A mutation in CAP that prevents it from
binding to the CAP binding site
D. A mutation in the lac repressor that
prevents it from binding allolactose
The regulatory elements in the lac oper-
on act to:
A. Repress transcription when there is no
lactose present
B. Repress transcription when there is
E. A and C
lactose present
C. Activate transcription when there is no
glucose present
D. Activate transcription when there is
glucose present
E. A and C
A bacterium needs to make a certain
lipid that it cannot obtain from its environ-
ment. That same lipid is involved in reg-
ulating the expression of the enzymes
D. Co-repressor
that make it. Which of the following is
the most likely regulatory function of the
lipid?
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What will be the effect on transcription
when an inhibitor is in play?
B. Prevent transcription
A. Allow transcription
B. Prevent transcription
What will be the effect on transcription
when an inducer is in play?
A. Allow transcription
A. Allow transcription
B. Prevent transcription
For a gene under positive control, which
of the following would prevent transcrip-
tion?
A. Repressor
Inhibitor
B. Corepressor
C. Inducer
D. Effector
E. Inhibitor
For a gene under negative control, which
of the following would you expect to find
bound to the repressor if there is active
transcription?
C. Inducer
A. Repressor
B. Corepressor
C. Inducer
D. Effector
E. Inhibitor
Which molecule serves as the inducer
for the lac operon?
A. cAMP D. Allolactose
B. Glucose
C. Lactose
D. Allolactose
Which of the following conditions will re-
sult in the greatest levels of transcription
, ASU BIO 340 Exam 3
Study online at https://quizlet.com/_hh0d5f
of the lac operon?
A. Lactose absent, glucose absent
D. Lactose present, glucose absent
B. Lactose absent, glucose present
C. Lactose present, glucose present
D. Lactose present, glucose absent
Which of the following mutations will re-
sult in the lowest level of transcription of
the lac operon when lactose is present?
A. An operator mutation that prevents
binding of the lac repressor D. A mutation in the lac repressor that
B. A mutation in the lac repressor that prevents it from binding allolactose
prevents it from binding to the operator
C. A mutation in CAP that prevents it from
binding to the CAP binding site
D. A mutation in the lac repressor that
prevents it from binding allolactose
The regulatory elements in the lac oper-
on act to:
A. Repress transcription when there is no
lactose present
B. Repress transcription when there is
E. A and C
lactose present
C. Activate transcription when there is no
glucose present
D. Activate transcription when there is
glucose present
E. A and C
A bacterium needs to make a certain
lipid that it cannot obtain from its environ-
ment. That same lipid is involved in reg-
ulating the expression of the enzymes
D. Co-repressor
that make it. Which of the following is
the most likely regulatory function of the
lipid?
