Gene regulation governing lactose operon of E.coli that involves the lac I gene product is :

Options

(a) Negative and inducible because repressor protein prevents transcription
(b) Negative and repressible because repressor protein prevents transcription
(c) Feedback inhibition because excess of b-galactosidase can switch off transcription
(d) Positive and inducible because it can be induced by lactose

Correct Answer:

Negative and inducible because repressor protein prevents transcription

Explanation:

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