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Q.

 In an inducible operon, the genes are

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a

usually expressed unless a signal turns them "off".

b

always expressed

c

never expressed

d

usually not expressed unless a signal turns them "on".

answer is A.

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Detailed Solution

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An inducible operon is one whose expression  increases quantitatively in response to an inducer. The lac operon is a classic example of an inducible operon and is induced by lactose and its structural analogues.

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