In lac operon regulation, which molecule acts as the inducer?

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Multiple Choice

In lac operon regulation, which molecule acts as the inducer?

Explanation:
Allolactose binds the LacI repressor and causes it to release from the operator, lifting repression so RNA polymerase can transcribe the lac operon genes. This molecule is produced from lactose when lactose is present, and its interaction with LacI is the signal that lactose is available for metabolism. The other proteins play different roles: LacI is the repressor itself, not the inducer; CAP (with cAMP) acts as an activator to boost transcription when glucose is scarce, but it does not initiate derepression; glucose levels influence CAP activity indirectly rather than serving as the inducer.

Allolactose binds the LacI repressor and causes it to release from the operator, lifting repression so RNA polymerase can transcribe the lac operon genes. This molecule is produced from lactose when lactose is present, and its interaction with LacI is the signal that lactose is available for metabolism.

The other proteins play different roles: LacI is the repressor itself, not the inducer; CAP (with cAMP) acts as an activator to boost transcription when glucose is scarce, but it does not initiate derepression; glucose levels influence CAP activity indirectly rather than serving as the inducer.

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