Transcription
Which of the following enzyme(s) is/are required for lactose fermentation?

All of these
Transacetylase
β-galactosidase
Galactoside permease

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Transcription
The sigma factor

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

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

approximately 25 bases upstream of the transcription start site
approximately 10 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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