The presence of which combination of molecules could prevent transcription of a repressible operon?
A) activator + repressor
B) inducer + corepressor
C) repressor + corepressor
D) activator + inducer
E) activator + corepressor

Question

Quizplus · Accepted Answer

Repressor and corepressor molecules work together to prevent transcription of a repressible operon. The repressor binds to the operator region of the operon, and the corepressor, often a metabolite or end product of the operon's pathway, binds to the repressor to activate it, enhancing its ability to block RNA polymerase and thus transcription.

The Presence of Which Combination of Molecules Could Prevent Transcription