Regulation of the trp operon at the level of transcription initiation is an example of

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The trp operon is a negative repressible system because it is usually active but can be turned off (repressed) when the product (tryptophan) is present in sufficient quantities. This repression occurs when the tryptophan binds to the repressor protein, enabling it to bind to the operator site and block RNA polymerase, thus preventing transcription.

Regulation of the Trp Operon at the Level of Transcription