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Gene regulation governing lactose operon...

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

A

negative and inducible because repressor protein prevents transcription

B

negative and repressible because repressor protein prevents transcription

C

feedback inhibition because excess of `beta`- galactosidase can switch off trascription

D

positive and inducible because it can be induced by lactose

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