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

corepression
desiccation
attenuation
activation

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Transcription
The location of first hexameric sequence typically found in pro-karyotic promoters is

approximately 35 bases upstream of the transcription start site
at the transcription start site
approximately 25 bases upstream of the transcription start site
approximately 10 bases upstream of the transcription start site

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