12. The primer for in vivo DNA replication is:
(A)The 3' hydroxyl of the preceding Okazaki fragment.
(B) A short piece of RNA.
(C) A nick made in the DNA template.
(D)A primer is not always required for DNA replication.
(E) All of these are true.

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統計： A(0), B(0), C(0), D(0), E(1) #2789512