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GK QUESTION#3978

In the lac operon model, what is the primary role of the allolactose molecule?

  1. AIt functions as an inducer, binding to the repressor protein and inactivating it.Correct answer
  2. BIt acts as a corepressor, binding with the repressor protein.
  3. CIt binds to the promoter to initiate transcription.
  4. DIt directly codes for the enzymes involved in lactose metabolism.
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Answer

A. It functions as an inducer, binding to the repressor protein and inactivating it.

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Explanation

Allolactose binds the lac repressor and reduces its affinity for the operator, inducing transcription of the lactose-use genes. Other controls, including glucose-dependent catabolite regulation, also influence expression.

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