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    Question

    Which of the following statements about the lac operon

    is correct?
    A It is an example of a repressible operon Correct Answer Incorrect Answer
    B The repressor protein binds to the operator to inhibit transcription Correct Answer Incorrect Answer
    C Lactose directly binds to the operator to start transcription Correct Answer Incorrect Answer
    D The presence of glucose activates the lac operon Correct Answer Incorrect Answer

    Solution

    The lac operon is an inducible operon that is switched off by the lac repressor, which binds to the operator region. When lactose is present, it inactivates the repressor, allowing transcription.

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