Molecular Basis of Inheritance Question 127

127. In an inducible operon, the genes are

[NEET Kar. 2013]

(a) Always expressed

(b) Usually not expressed unless a signal turns them “on”

(c) Usually expressed unless a signal turns them “off”

(d) Never expressed

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Answer : b

Hints & Solution

(b) Inducible operons are usually switched off. This is a type of operon which is switched on when a chemical called inducer is present. the inducer is almost always a substrate.



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