The role of a metabolite that controls a repressible operon is to
A) bind to the promoter region and decrease the affinity of RNA polymerase for the promoter.
B) bind to the operator region and block the attachment of RNA polymerase to the promoter.
C) increase the production of inactive repressor proteins.
D) bind to the repressor protein and inactivate it.
E) bind to the repressor protein and activate it.

Question

Quizplus · Accepted Answer

The role of a metabolite in a repressible operon is to bind to the repressor protein and activate it. This activated repressor can then bind to the operator region, preventing RNA polymerase from transcribing the genes in the operon.

The Role of a Metabolite That Controls a Repressible Operon