In E. coli, the lac operon gets switched on when

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lactose is present and it binds to the repressor

repressor binds to operator

RNA polymerase binds to the operator

lactose is present and it binds to RNA polymerase

answer is A.

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Detailed Solution

When lactose is present, it act as an inducer and binds to the repressor and inactivates it. This repressor fails to bind to operator. Therefore, the RNA polymerase binds to the promoter and transcript mRNA thus switching on the lac operon and allowing transcription to proceed.

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