What is lactose in the context of lac operon?

What is lactose in the context of lac operon?
  1. Substrate for beta-galactosidase
  2. Repressor protein of lac operon
  3. Inducer for trp operon
  4. Constitutively expressed protein

Solution

Lactose is the substrate for the enzyme beta-galactosidase and it regulates switching on and off of the lac operon.

Asked in: NCERT

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