A) co-repressor binds with repressor
B) co-repressor does not bind with repressor
C) co-repressor binds with inducer
D) c-AMP has negative effect on lac operon
Correct Answer: A
Solution :
In case of a repressible operon, the free repressor cannot bind to the operator. Only repressor- corepressor complex binds with the operator. Since the product of the regulator (the repressor) acts by shutting off the transcription of structural genes, it is referred to as a negative control system.
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