In E. coli an operator gene combine with...

In E. coli an operator gene combine with

A

Inducer gene to switch on structural gene action

B

Inducer gene to switch off structural gene action

C

Regulator protein (repressor) to switch off structural gene action

D

Regulator protein to switch on gene action

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The correct Answer is:

C

On binding of repressor protein to operator gene it prevent transcription of structural gene

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Assertion : Regulator and operator genes are not associated with contitutive genes. Reason : Constitutive genes need not be repressed.