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Which of the following acts as an inducer in the lac operon?(a) glucose(b) tryptophan(c) lactose(d) galactoseThe question was asked in an online quiz.I'd like to ask this question from Gene Expression Control in section Control of Gene Expression of Cell Biology

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Correct ANSWER is (c) lactose

To EXPLAIN I would say: When lactose is PRESENT in the medium, it binds to the REPRESSOR protein changing its conformation while preventing the former’s binding at the operator region. Thus the structural genes are transcribed and lactose is catabolized, THEREFORE lactose acts as an inducer in the lac operon.



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