Gene regulation governing lactose operon of E. coli that involves the lac I gene product is

Options

A. Positive and inducible because it can be induced by lactose
B. Negative and inducible because repressor protein prevents transcription
C. Negative and repressible because repressor protein prevents transcription
D. Feedback inhibition because excess of `Beeta-galactosidase can swich off transcription

Answer

B

Explanation

Lac I gene prodeces an inhibitor or repressor that induces negative regulation of lac operon promoter from binding to RNA operater gene and repress promoter from binding to RNA polymerase Repressor is meant to block the operator gene so that structural genes are unable to form mRNA thus, stopping the transcription of genes