It is possible for a repressor to negatively regulate the expression of an operon because:
A) the repressor induces the expression of the inducer by binding to the promoter that comes before the inducer gene.
B) one of the structural genes expressed in the operon negatively regulates the repressor.
C) the repressor-binding site overlaps the promoter site of the operon, allowing it to physically block the binding of RNA polymerase.
D) the repressor-binding site on the DNA overlaps with the translation start site, thereby preventing the transcription.
E) the repressor physically blocks where the activator should be binding on the operator region.

Question

Quizplus · Accepted Answer

The repressor can bind to the operator region, which often overlaps with the promoter, blocking RNA polymerase from binding and initiating transcription.

It Is Possible for a Repressor to Negatively Regulate the Expression