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In the lac operon, the structural genes are switched off when repressor binds to the

1. Operator
2. Promoter
3. Regulator
4. Inducer E. Allolactose

Correct answer: Operator

Solution

In the lac operon, the repressor shuts off transcription by binding the operator, a DNA segment that controls access to the structural genes. This blocks RNA polymerase from transcribing the operon.

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