Biology 251 - Genetics » Spring 2021 » Topic 12.3 Quiz

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Question #1
The lac operon positive regulation is modulated by binding of:
A.   allolactose.
B.   sucrose
C.   lactose
D.   cAMP.
E.   galactose
Question #2
The lac operon regulation by sucrose depletion is:
A.   indirect, by detection of elevated cAMP levels.
B.   direct, by binding of lactose.
C.   direct, by binding of sucrose.
D.   indirect, by detection of low cAMP levels.
Question #3
In conditions of low sucrose and and low lactose, expression from the lac operon would be:
A.   off because the repressor is bound.
B.   on at a basal level because the repressor is off the operon, but CAP is bound.
C.   on at a high level because CAP is bound.
D.   on at a low level because CAP is bound.
E.   on at a basal level because the repressor and CAP are both off of the operon.
Question #4
In conditions of high sucrose and high lactose, expression from the lac operon would be:
A.   at a level that would be called leaky.
B.   at a basal level because the repressor is not bound.
C.   at a high level because both the repressor and CAP are not bound.
D.   off because CAP is not bound.
Question #5
In conditions where lactose is not available, the operon is considered to be "off" but leaky expression for production of a minimal amount of the operon's protein products still occurs.
A.   True
B.   False

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