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Question: Answered & Verified by Expert
In E.coli, the lac operon gets switched on when:
BiologyMolecular Basis of InheritanceNEET
Options:
  • A lactose is present and it binds to the repressor
  • B repressor binds to operator
  • C RNA polymerase binds to the operator
  • D lactose is present and it binds to RNA polymerase
Solution:
2654 Upvotes Verified Answer
The correct answer is: lactose is present and it binds to the repressor
Presence of lactose switches on lac operon as allolactose removes the repressor for RNA polymerase to bind.

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