Transcription
A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called

desiccation
attenuation
activation
corepression

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Transcription
The sigma factor

provides the catalytic function of cleaving off pyrophosphates during mRNA synthesis
accomplishes DNA restriction
is responsible for recognizing the termination sequence
recognizes the promotor

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