Regulation of the lac operon by lactose involves a(n) _______ that inhibits transcription, while regulation by glucose involves a(n) _______ that stimulates transcription.

Question

Quizplus · Accepted Answer

Lactose acts as an inducer, binding to the repressor protein and preventing it from binding to the operator region, thus allowing transcription to occur. Glucose, on the other hand, inhibits transcription by preventing the production of the cAMP activator protein, which is necessary for RNA polymerase to bind to the promoter region. Therefore, regulation by lactose involves a repressor, while regulation by glucose involves an activator.

Regulation of the Lac Operon by Lactose Involves A(n) _______