In the Lac operon,the protein that binds to the operator to prevent transcription is

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The Lac operon has a repressor protein that binds to the operator to prevent transcription of the genes involved in lactose metabolism. When lactose is present, it binds to the repressor protein, causing a conformational change that releases it from the operator and allows transcription to occur. RNA polymerase binds to the promoter region to initiate transcription, but it is not responsible for preventing it in the absence of lactose. DNA polymerase is not involved in gene expression control.

In the Lac Operon,the Protein That Binds to the Operator