What is the likely eﬀect of a mutation in the promoter sequence of the lac operon?

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Lactose will fail to bind to the repressor protein.

The lac operon will operate normally.

The lac operon will be unable to initiate transcription.

The structural genes will continue to be transcribed.

answer is B.

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Detailed Solution

The likely eﬀect of a mutation in the promoter sequence of the lac operon is that ,the RNA polymerase cannot bind to the mutant promoter as a result, the lac operon cannot be expressed.

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