Transcription of the lac operon is most efficient when ____.
A) cAMP levels are low
B) the CAP site of the promoter is not bound to cAMP
C) glucose is present and lactose is absent
D) lactose is present and glucose is absent
E) lactose and glucose are present

Question

Quizplus · Accepted Answer

The lac operon transcription is most efficient when lactose is present (to inactivate the repressor) and glucose is absent (leading to high cAMP levels, which facilitates CAP binding and enhances transcription).

Transcription of the Lac Operon Is Most Efficient When ____