Question

fill in the blank question

the protein which is capable of stopping the output of product encoded by the lac operon is called a(n)

Explanation:

Identify the regulatory protein of the lac operon

The lac operon is regulated by a specific protein that binds to the operator region to block transcription by RNA polymerase when lactose is absent.

Determine the name of the protein

This regulatory protein that stops or represses transcription is called a repressor (specifically, the lac repressor).

Answer:

The protein which is capable of stopping the output of product encoded by the lac operon is called a(n) <blank>repressor</blank>