In the lac operon, the CAP site is located next to the ________. When both lactose and glucose are present, this leads to a rate of transcription that is ________.
A) terminator, low
B) promoter, high
C) terminator, high
D) promoter, low

Question

Quizplus · Accepted Answer

The CAP site is located next to the promoter in the lac operon. When both lactose and glucose are present, the level of cAMP in the cell is low, which means that the CAP protein will not bind to the CAP site. This results in a lower rate of transcription from the promoter. Therefore, the correct choice is D, promoter, low.

In the Lac Operon, the CAP Site Is Located Next