NEET 2015 Botany Gene Expression MCQ Question
Gene regulation governing lactose operon of E. coli that involves the lac I gene product is
positive and inducible because it can be induced by lactose.
negative and inducible because repressor protein prevents transcription.
negative and repressible because repressor protein prevents transcription.
feedback inhibition because excess of β-galactosidase can switch off transcription.
Correct Answer
Detailed Explanation
The lac operon is negatively regulated by the lac repressor, which binds to the operator to prevent transcription.
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