Synthesis of a Repressible Enzyme is Stopped by The

Question

Synthesis of a repressible enzyme is stopped by the
A)allosteric transition.
B)substrate binding to the repressor.
C)corepressor binding to the operator.
D)corepressor-repressor complex binding to the operator.
E)end product binding to the promoter.

Accepted Answer

The corepressor-repressor complex binds to the operator and prevents RNA polymerase from transcribing the gene. This is an example of negative regulation, where the presence of a small molecule (corepressor) turns off the transcription of a gene.