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CGP EDU Academic Team
Published on: August 12, 2026
In E. coli the lac operon gets switched on when
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A
In 
. coli the lac operon gets switched on when lactose is present and it binds to the repressor. Lac operon gets switched on in the presence of inducer like lactose. When lactose binds to repressor and prevents it from binding to operator. This makes RNA polymerase free to bind to promoter and transcribe structural genes of lac operon.
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