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  3. 12th Class
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12th Class Biology Sample Paper Biology Olympiad Sample Paper-3

  • question_answer
    In E coli cell, according to operon theory, an operator gene combines with

    A)  Inducer to 'switch on' structural gene transcription

    B)  Repressor protein to 'switch off' structural gene transcription

    C)  Regulator gene to 'switch on' structural gene transcription

    D)  Repressor protein to 'switch on' structural gene transcription.

    Correct Answer: B

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