The presence of which combination of molecules would lead to active transcription of an operon?
A)activator + corepressor
B)activator + repressor
C)inducer + corepressor
D)repressor + corepressor
E)activator + inducer

Question

Quizplus · Accepted Answer

An activator and an inducer are required for active transcription of an operon. The activator binds to the regulatory region of the DNA, while the inducer binds to the repressor, preventing it from binding to the operator and allowing RNA polymerase to transcribe the operon. A corepressor typically works with a repressor to inhibit transcription, so choices A and D are incorrect. Choice B is also incorrect because an activator is required, not a repressor.

The Presence of Which Combination of Molecules Would Lead to Active