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Transcription and Regulation - Medical Science

Q1:

RNA polymerase in prokaryotes has a removable

A alpha subunit

B beta subunit

C both (a) and (b)

D sigma subunit

ANS:D - sigma subunit

Sigma subunit is a factor that attaches to rna-polymerase. Rna-polymerase cannot recognise promoter on DNA strand so sigma factor binds to rna-polymerase in order to attach properly to promoter region and cover all consensus sequence.