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Which of the following is required as inducer(s) for the expression of Lac operon?

1. Glucose
2. Galactose
3. Lactose
4. Lactose and galactose

Correct answer: Lactose

Solution

Lactose (more precisely allolactose, derived from lactose) binds the lac repressor and removes it from the operator, permitting transcription. Glucose actually suppresses lac operon expression, and galactose is not the inducer.

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