Gene expression of lactose-digesting genes is controlled by the lac operon that accounts for varying amounts of lactose or ...

The repressor inhibits transcription by binding to the lac operator (O). Repressor binding to the operator is prevented by the inducer.

For example, repression of the lac operon by its repressor ... Now unable to bind to the operator/promoter region, the lacI protein can no longer block RNA polymerase from transcribing the ...