Tryptophan synthesis can be controlled by controlling transcription but not translation.

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Tryptophan synthesis can be controlled at both the transcription and translation levels. At the transcription level, the trp operon in bacteria is regulated by the presence of tryptophan, and at the translation level, the concentration of tryptophan can affect the ribosome's ability to initiate translation of genes involved in its synthesis.

Tryptophan Synthesis Can Be Controlled by Controlling Transcription but Not