APFIVE Directionality of Transcription
The observation that RNA polymerase adds nucleotides only to the 3’ end of a growing RNA strand best supports which of the following conclusions?
A
RNA polymerase can start RNA synthesis at any point on the DNA.
B
RNA synthesis occurs in a 5′ to 3′ direction.
C
RNA synthesis occurs in a 3′ to 5′ direction.
D
RNA polymerase requires a primer to initiate RNA synthesis.
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