The lac repressor protein controls expression of the lac operon by binding to the:
A)lac structural genes to repress expression.
B)lacZ and lacY genes only to repress expression.
C)lac operator site to repress expression.
D)lac promoter site to repress expression.
E)All of the answer options are correct.

Question

Quizplus · Accepted Answer

The lac repressor protein binds to the lac operator site, which is located adjacent to the promoter region of the lac operon. This binding prevents RNA polymerase from transcribing the genes of the operon, resulting in the repression of expression of the lac genes. The lac repressor protein does not bind directly to the structural genes or the promoter region of the operon.

The Lac Repressor Protein Controls Expression of the Lac Operon