In the lac operon, the structural genes are switched off when
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a
(a)A short sequence of $DNA$ where the repressor binds preventing $RNA$ polymerase from attaching to the promoter this is called on/off switch of transcription.
(a)A short sequence of $DNA$ where the repressor binds preventing $RNA$ polymerase from attaching to the promoter this is called on/off switch of transcription.
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