What is the role of the operator in an operon

Posted By Admin @ September 03, 2022


What is the function of the operator in an operon

A. Provide a site on the DNA where the repressor can bind and stop transcription
B. Provide a site on the DNA where RNA polymerase can bind to begin transcription
C. Code for the repressor protein
D. Code for the RNA polymerase protein


The answer is; A

The operator site is usually associated with the promoter region of the operon. This region is bound by a repressor. The repressor acts as a physical barrier so the RNA polymerase  does not bind to its promoter, or even if it binds, does not proceed to transcribe the genes.

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