How does tryptophan, the end product of the trp operon, function in the regulation of the operon?
A) It binds to the repressor preventing it from binding to DNA thus allowing transcription of the operon.
B) It binds to the repressor and only then can the repressor bind to DNA allowing transcription of the operon.
C) It binds directly to DNA and inhibits transcription of the operon.
D) It binds to the repressor and only then can this complex bind to DNA preventing transcription of the operon.
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