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Moderate

Positive Gene Regulation

APBIO-WZNBYE

Which of the following is an example of positive gene regulation?

A

The tryptophan gene, in which the presence of tryptophan functions as a corepressor to prevent its own transcription.

B

The lac gene, in which the repressor preventing the synthesis of the enzymes that degrade lactose is deactivated by the presence of lactose.

C

CAP, which acts as a required transcription factor for the enzymes that degrade lactose.

D

All of the above.