Transcription
Which of the following statement defines a replicon?

A DNA molecule that is able to replicate and be maintained
A DNA molecule that encodes pili for conjugation
The enzyme responsible for transposition
A DNA template which is used in transcription

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Transcription
The sigma factor

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

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

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

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