In the lac operon, the structural genes are switched off when

Repressor binds to operator

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Repressor binds to promotor

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Repressor binds to regular

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Repressor binds to inducer

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Repressor binds to allolactose

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Solution

The correct option is B Repressor binds to operator
A short sequence of DNA (operator), where the repressor binds preventing RNA polymerase from attaching to the promoter, is called 'on/off switch' of transcription. When the repressor binds to the operator in lac operon, the structural genes are switched off.
So, the correct answer is 'Repressor binds to operator'

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