The lactose repressor
A)is transcribed with the structural lac genes.
B)is activated by binding lactose.
C)is inactivated by binding lactose.
D)requires lactose for its transcription.

Question

Quizplus · Accepted Answer

The lactose repressor is normally bound to the operator region of the lac operon, which prevents transcription of the structural genes involved in lactose metabolism. When lactose is present, it binds to the repressor and causes a conformational change that inactivates the repressor, allowing transcription of the lac genes to occur.

The Lactose Repressor