AP Biologyeasymcq1 pt
The lac operon is turned ON when
A.allolactose binds the repressor and releases it from the operator
B.glucose is abundant
C.the repressor binds the operator
D.tryptophan accumulates
Explanation
Core Concept
Lactose present → allolactose inactivates the repressor → RNA polymerase transcribes the lactose-metabolism genes. An inducible system, default off.
Correct Answer
Aallolactose binds the repressor and releases it from the operator
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