21. Which of the following enzymes can introduce negative supercoils in DNA
replication?
(A) DNA ligase
(B) DNA primase
(C) DNA helicase
(D) DNA gyrase
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統計: A(1), B(1), C(2), D(3), E(0) #3331915
統計: A(1), B(1), C(2), D(3), E(0) #3331915