What blocks RNA polymerase in the lac operon?
Repressor protein
Activator protein
Enhancer
Silencer
Answer
Repressor protein blocks RNA polymerase in the lac operon by binding to the operator region, which is located just upstream of the promoter. This binding prevents RNA polymerase from binding to the promoter and initiating transcription of the lac genes. The repressor protein is only produced when the lac operon is not induced, meaning that there is no lactose present.
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