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Which of the following is an example of positive gene regulation?
The tryptophan gene, in which the presence of tryptophan functions as a corepressor to prevent its own transcription.
The lac gene, in which the repressor preventing the synthesis of the enzymes that degrade lactose is deactivated by the presence of lactose.
CAP, which acts as a required transcription factor for the enzymes that degrade lactose.
Inducible operons in which the inducer is a substrate.