問題詳情

30. The following statements about DNA replication is E. coli are correct except:
(A) Both leading strand and lagging strand require primer.
(B) DNA polymerase adds a new nucleotide to the free 3’OH of the existing nucleic acid.
(C) The principal replication enzyme is DNA polymerase I.
(D) It also has a 3’5’ exonuclease activity.
(E) It is a processive enzyme.

參考答案

答案：C
難度：計算中-1
書單：沒有書單，新增

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【陳夢陽】評論

In E. coli, the principal replication enzyme is DNA polymerase III, which is a complex enzyme that includes a core polymerase, a proofreading exonuclease, and other subunits that enhance the enzyme's processivity and efficiency.DNA polymerase I is also involved in DNA replication in E. coli, but it has a secondary role in removing RNA primers and filling in gaps left behind by the main replication enzyme, DNA polymerase III.