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The trp operon and tet operon are classic examples of gene regulation mechanisms in prokaryotes, illustrating how bacteria efficiently control the expression of genes in response to environmental conditions. The trp operon is primarily found in *Escherichia coli* and regulates the biosynthesis of the amino acid tryptophan. It is a repressible operon, meaning that its expression is generally “on” but can be turned “off” when the end product, tryptophan, is abundant. The operon consists of a promoter, an operator, and ____ ____ _________ _________ __________ _________ _________ __________ ________ _________ ______.
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