ASU BIO 340 EXAM 3 ACTUAL 2026 QUESTIONS
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Terms in this set (36)
What will be the effect on B Explanation: An inhibitor prevents activator
transcription when an inhibitor is in from binding to DNA; activators are used in
play? positive regulation (increasing transcription) -
A. Allow transcription B. Prevent thus, the inhibitor prevents the activator from
transcription positive regulating (increasing) transcription.
What will be the effect on A Explanation: When an inducer is in play, it will
transcription when an inducer is in allow transcription.
play?
A. Allow transcription B. Prevent
transcription
For a gene under positive control, E Explanation: Positive regulation includes
which of the following would activators (affected by effectors and inhibitors);
prevent transcription? inhibitors prevent activator from binding to DNA,
A. Repressor B. Corepressor C. thus preventing transcription.
Inducer D. Effector E. Inhibitor
, For a gene under negative control, C Explanation: In negative regulation, there are
which of the following would you repressors (affected by correpressors and
expect to find bound to the inducers). If there were a corepressor, the
repressor if there is active repressor would successfully bind to the
transcription? A. Repressor B. operator and prevent transcription. Inducers,
Corepressor C. Inducer D. Effector however, prevent the binding of the repressor -
E. Inhibitor thus causing a prevention of it doing its job, and
allowing transcription.
Which molecule serves as the D Explanation: Allolactose is the molecule that
inducer for the lac operon? binds to repressor protein, making it unable to
A. cAMP B. Glucose C. Lactose D. bind to the operator.
Allolactose
Which of the following conditions D Explanation: From the perspective of the cell, it
will result in the greatest levels of is most efficient to repress expression of the
transcription of the lac operon? genes allowing for metabolism of lactose when
A. Lactose absent, glucose absent it's absent, to allow it when present, but only to
B. Lactose absent, glucose present prioritize it when glucose (the preferred food
C. Lactose present, glucose present source) is absent. In C, allolactose will also be
D. Lactose present, glucose absen present, allowing transcription, but positive
regulation (i.e. increase in transcription) only
happens as in D, when glucose is absent.
AND 100% CORRECT ANSWERS
Save
Terms in this set (36)
What will be the effect on B Explanation: An inhibitor prevents activator
transcription when an inhibitor is in from binding to DNA; activators are used in
play? positive regulation (increasing transcription) -
A. Allow transcription B. Prevent thus, the inhibitor prevents the activator from
transcription positive regulating (increasing) transcription.
What will be the effect on A Explanation: When an inducer is in play, it will
transcription when an inducer is in allow transcription.
play?
A. Allow transcription B. Prevent
transcription
For a gene under positive control, E Explanation: Positive regulation includes
which of the following would activators (affected by effectors and inhibitors);
prevent transcription? inhibitors prevent activator from binding to DNA,
A. Repressor B. Corepressor C. thus preventing transcription.
Inducer D. Effector E. Inhibitor
, For a gene under negative control, C Explanation: In negative regulation, there are
which of the following would you repressors (affected by correpressors and
expect to find bound to the inducers). If there were a corepressor, the
repressor if there is active repressor would successfully bind to the
transcription? A. Repressor B. operator and prevent transcription. Inducers,
Corepressor C. Inducer D. Effector however, prevent the binding of the repressor -
E. Inhibitor thus causing a prevention of it doing its job, and
allowing transcription.
Which molecule serves as the D Explanation: Allolactose is the molecule that
inducer for the lac operon? binds to repressor protein, making it unable to
A. cAMP B. Glucose C. Lactose D. bind to the operator.
Allolactose
Which of the following conditions D Explanation: From the perspective of the cell, it
will result in the greatest levels of is most efficient to repress expression of the
transcription of the lac operon? genes allowing for metabolism of lactose when
A. Lactose absent, glucose absent it's absent, to allow it when present, but only to
B. Lactose absent, glucose present prioritize it when glucose (the preferred food
C. Lactose present, glucose present source) is absent. In C, allolactose will also be
D. Lactose present, glucose absen present, allowing transcription, but positive
regulation (i.e. increase in transcription) only
happens as in D, when glucose is absent.
