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In an inducible operon, the genes are

1. Always expressed
2. Usually not expressed unless a signal turns them “on”
3. Usually expressed unless a signal turns them “off”
4. Never expressed

Correct answer: Usually not expressed unless a signal turns them “on”

Solution

Inducible operons are typically off because the repressor blocks transcription. When an inducer is present, it inactivates the repressor or otherwise enables transcription, turning the genes on.

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