How does lactose induce the lac operon?

How does lactose induce the lac operon?
  1. By hydrolyzing lactose into its monomeric units
  2. By synthesizing the repressor protein
  3. By inactivating the repressor protein
  4. By binding to the operator region of the operon

Solution

In the presence of an inducer, such as lactose or allolactose, the repressor is inactivated by interaction with the inducer. This allows RNA polymerase access to the promoter and transcription proceeds.

Asked in: NCERT

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