Imagine That You Discover a Bacterial Operon Involved in the Synthesis

Multiple Choice

Imagine that you discover a bacterial operon involved in the synthesis of vitamin B₁₂.This operon is regulated by a repressor protein that binds to an operator sequence.Vitamin B₁₂ is the allosteric effector of the repressor-the molecule that binds to the repressor to affect its activity.Predict how vitamin B₁₂ will influence repressor activity.

A) When vitamin B₁₂ binds to the repressor,the repressor binds to the operator.
B) When vitamin B₁₂ binds to the repressor,the repressor cannot bind to the operator.
C) When vitamin B₁₂ binds to the repressor,the repressor can bind to RNA polymerase.
D) When vitamin B₁₂ binds to the repressor,the repressor cannot bind to RNA polymerase.