In a repressible operon, the repressor molecule
A) must first be activated by a co-repressor.
B) can repress the transcription of the operon on its own.
C) is a molecule made from the operon.
D) binds to the mRNA.
E) must first be made negative to control the operon.

Question

Quizplus · Accepted Answer

In a repressible operon, the repressor molecule must first be activated by a co-repressor to bind to the operator and prevent transcription. Without the co-repressor, the repressor cannot bind and the operon will be transcribed.

In a Repressible Operon, the Repressor Molecule