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In negative operon

1. co-repressor binds with repressor
2. co-repressor does not bind with repressor
3. co-repressor binds with inducer
4. CAMP have negative effect on lac operon

Correct answer: co-repressor binds with repressor

Solution

In a negative operon, gene expression is blocked by a repressor protein. In a repressible system, a co-repressor binds to the repressor and activates it so it can attach to the operator and stop transcription.

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