You Have Discovered a Bacterial Operon Involved in the Synthesis

You have discovered a bacterial operon involved in the synthesis of vitamin E. This operon is regulated by a repressor protein that binds to an operator sequence. Vitamin E is the allosteric effector of the repressor; i.e., the molecule that binds to the repressor to regulate its activity. Predict how vitamin E will influence repressor activity.

A) When vitamin E binds to the repressor, the repressor binds to the operator.
B) When vitamin E binds to the repressor, the repressor cannot bind to the operator.
C) When vitamin E binds to the repressor, the repressor can bind to RNA polymerase.
D) When vitamin E binds to the repressor, the repressor cannot bind to RNA polymerase.