試題詳解

44. How does extracellular glucose inhibit transcription of the lac operon?
(A) by strengthening the binding of the repressor to the operator
(B) by weakening the binding of the repressor to the operator
(C) by degrading the lac operon gene
(D) by inhibiting RNA polymerase from opening the strands of DNA to initiate transcription
(E) by reducing the levels of intracellular cAMP