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

Question

Quizplus · Accepted Answer

The Lac operon is a system in bacteria for regulating the genes involved in lactose metabolism. The repressor protein, encoded by the lacI gene, is normally bound to the operator sequence, which is located between the promoter and the structural genes. When lactose is present, it binds to the repressor, causing it to change shape and release from the operator. This allows RNA polymerase to bind to the promoter and initiate transcription of the structural genes, which code for enzymes involved in lactose utilization. Therefore, the correct answer is A) The repressor.

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