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Unformatted text preview: . Tryptophan is therefore a corepressor . The trp operon is an example of a repressible operon because the structural genes are active and are inactivated when tryptophan is present. Structural Genes Repressor Inducible Operons Inactive Active (inhibits) Repressible Operons Active Inactive (inhibits when activated) Negative Feedback Inhibition In addition to genetic regulation, tryptophan can inhibit the first enzyme in the synthesis pathway. This is an example of feedback inhibition. The presence of high levels of tryptophan inhibits the activity of the enzyme as shown in the biosynthesis pathway below....
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