78. What acts as the nucleophile in the mechanism of nucleotide addition by RNA polymerase?
(A) The 5' phosphate of an incoming nucleotide
(B) A water molecule
(C) A 5' hydroxyl of the template DNA
(D) A 3' hydroxyl from the RNA being extended
(E) An aspartate in the active site
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RNA聚合酶會攻擊要延長的RNA的3’端...
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