Question

Regulation of lac operon by repressor is referred to as:

• A. Inducible regulation
• B. Repressible regulation
• C. Negative regulation
• D. Positive regulation

Hint:

Negative regulation means a repressor must be removed or inactivated for transcription to occur.

Answer 1

The Correct Option is C

In the lac operon, the repressor protein binds to the operator and inhibits transcription. This inhibition is lifted when an inducer (like lactose) is present. Since the default state is "off" due to repressor action and transcription only happens when the repressor is inactivated, this is termed negative regulation.