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Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion : Isopropylthiogalactoside (IPTG) is a gratuitous inducer of lactose operon.
Reason : Gratuitous inducers are chemical analogs which behave like natural inducer but they do not serve as substrate for the enzymes that are subsequently synthesized.
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- both (A) and (R) are true and (R) is the correct reason for (A)
- both (A) and (R) are true but (R) is not the correct reason for (A)
- (A) is true but (R) is false
- (A) is false but (R) is true
Correct Option: A
Gratuitous inducer is an analogue of a natural inducer that is capable of inducing an operon while not serving as a substrate for the enzyme being induced. IPTG is a gratuitous inducer. It induces gene expression but itself is not metabolized by the enzyme.
