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Transcription and Regulation - Medical Science

Q1:

Transcription by E. coli polymerase occurs in

A four phases known as initiation, propagation, elongation and termination

B three phases known as initiation, elongation and termination

C two phases known as initiation and termination

D none of the above

ANS:B - three phases known as initiation, elongation and termination

Please explain the answer.