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During transcription, the synthesis of the mRNA strand proceeds in which direction?"

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a) 5' to 3' only

b) 3' to 5' only

c) both 5' to 3' and 3' to 5'

d) either 5' to 3' and 3' to 5'

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  1. a 5' to 3'


  2. A). 5' to 3' only .

    The mRNA chain grows in the 5' to 3' direction as RNA polymerase starts copying the 3' to 5' strand of DNA. (Remember the 2 strands are anti0 parallel).
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