Transcription
Which of the following component of RNA polymerase facilitates the recognition of promoter sequences?

c subunit
a subunit
s subunit
b subunit

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

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