Question

Lac operon is called negative regulation because__________

• A. The repressor protein inhibits the transcription of structural genes.
• B. It gets active only in pressure of lactose
• C. The structural genes can digest lactose
• D. None of these

Answer 1

The correct option is A

The repressor protein inhibits the transcription of structural genes.

In lac operon, the inhibitor gene codes for an inhibitor protein which sits upon the operator gene and restricts the transcription of structural genes. Thus, lac operon is an example of negative regulation.