First slide

Regulation of Gene Expression

Question

In an inducible operon, the genes are

Easy

A

Usually not expressed unless a signal turns them"on".
B

Usually expressed unless a signal turns them "off".
C

Never expressed
D

Always expressed

Solution

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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