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Operon Concept (Level : Moderate)

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Multiple Choice

What happens in lac operon when glucose is present?

  1. Cyclic AMP is high, the catabolite activator protein (CAP) binds to the activator binding site and transcription of lactose is turned on.
  2. Cyclic AMP is low, CAP does not bind to the activator binding site and transcription is turned off.
  3. Cyclic AMP is low, CAP binds to the activator binding site and transcription of lactose is turned on.
  4. Cyclic AMP is high, CAP does not bind to the activator binding site and transcription of lactose is turned on.
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