Extracellular glucose inhibits transcription of the lac operon by _____.
A)strengthening the binding of repressor to the operator
B)weakening the binding of repressor to the operator
C)inhibiting RNA polymerase from opening the strands of DNA to initiate transcription
D)reducing the levels of intracellular cAMP
E)activating adenylyl cyclase

Question

Quizplus · Accepted Answer

Extracellular glucose reduces the levels of intracellular cAMP, which is necessary for the activation of CAP (catabolite activator protein) that facilitates the binding of RNA polymerase to the lac operon promoter.

Extracellular Glucose Inhibits Transcription of the Lac Operon by _____