operon model

How Is The Trp Operon Regulated?

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How Is The Trp Operon Regulated? Regulation of the trp operon is determined by the concentration of tryptophan; when adequate tryptophan is present in the growth medium, there is no need for tryptophan biosynthesis. Transcription is turned off when a high concentration of tryptophan is present, and is turned on when tryptophan is absent. How

How Do Operons Regulate Gene Expression In Prokaryotes?

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How Do Operons Regulate Gene Expression In Prokaryotes? Prokaryotic operons are commonly controlled by the binding of repressors to operator regions, thereby preventing the transcription of the structural genes. Such operons are classified as either repressible operons or inducible operons. How do prokaryotes use operons to control genes? In prokaryotic cells, there are three types