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How is the lac operon in E.coli regulated in the presence of lactose?

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The repressor binds to the operator region, blocking RNA polymerase and preventing transcription.

Lactose interacts with the repressor protein, activating it to bind more strongly to the operator.

Lactose or allolactose inactivates the repressor, allowing RNA polymerase to transcribe the operon.

The repressor synthesizes more lactose, inducing the operon directly.

answer is C.

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Detailed Solution

The lac operon in E.coli is regulated in the presence of lactose by inactivating the repressor protein. The allolactose inactivates the repressor, allowing RNA polymerase to transcribe the operon.

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