When does lac operon in E. coli become "switc | vedclass

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(C) The correct answer is $C$. In the $lac$ operon, the repressor protein is synthesized in an active form that binds to the operator region, preventi

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Lactose is present, and it binds to the repressor.

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(C) The correct answer is $C$. In the $lac$ operon, the repressor protein is synthesized in an active form that binds to the operator region, preventing $RNA$ polymerase from transcribing the structural genes. When lactose is present in the medium, it acts as an inducer. Lactose binds to the repressor protein, causing a conformational change that prevents the repressor from binding to the operator. As a result, the operator becomes free, allowing $RNA$ polymerase to bind to the promoter and initiate the transcription of the structural genes. Thus, the $lac$ operon is switched on in the presence of lactose.

When does $lac$ operon in $E. coli$ become "switched on"?

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