False statement is:

A. Repressor binds operator gene

B. Regulator genes produce repressor subunits

C. IPTG is inducer but not substrate

D. Regulator gene is inducible

Correct Answer: Regulator gene is inducible

Description: Ans. D. Regulator gene inducible(Ref: Harper 31/e page 412)Structural genes are inducible, not the regulator genes.Lac I gene produces Repressor subunits.IPTG is an inducer of lac-operon, but itself is not a substrate. This is called gratuitous inducer.

Category: Biochemistry

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