20. Which of the following reactions is involved in the proofreading process of DNA polymerase?
(A) 5' to 3' exonuclease activity.
(B) 5' to 3' endonuclease activity.
(C) 3' to 5' exonuclease activity.
(D) 3' to 5' endonuclease activity.

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統計： A(0), B(0), C(1), D(0), E(0) #3308499

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