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AP Biology/Unit 6: Gene Expression and Regulation
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Directionality of Transcription
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Which of the following conclusions is best supported by the evidence that RNA polymerase builds RNA by adding nucleotides only to the 3′ side?

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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