To Inhibit the Transcription of Operon Genes,the LacI Gene Product

Question

To inhibit the transcription of operon genes,the lacI gene product binds to
A)the operator.
B)the promoter.
C)the repressor.
D)the inducer.
E)β-galactosidase.

Accepted Answer

The lacI gene product, also known as the lac repressor, binds to the operator region of the lac operon DNA, which overlaps the promoter region. This binding prevents RNA polymerase from binding to the promoter and transcribing the genes of the operon, inhibiting their expression.