Essential Biochemistry - Regulation Of Gene Expression And Mutation (Section 2 - No. 15)
What is the role of the repressor protein in the lac operon?
It binds to the promoter site and prevents transcription.
It binds to the operator site and blocks transcription.
It activates RNA polymerase.
It codes for the enzyme beta-galactosidase.
Explanation
The repressor protein binds to the operator, preventing transcription.
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