Transcription
Which of the following enzyme is used for synthesis of RNA under the direction of DNA?

RNA ligase
RNA polymerase
DNA ligase
DNA polymerase

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Transcription
The sigma factor

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

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

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

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