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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 a series of structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes necessary for ___ __________ ______ _____ _____ _____ _____ ___ _____ ____ _________.
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