本题目来源于试卷: Continuity and Change D.1 DNA Replication，类别为 IB生物学
[单选题]
Which event happens in the leading strand but /9uzzun*z c a bi+6):eh-vku dz gu;)onotnlu l m,ijstuyve1t)q:+ i271 in the lagging strand?
A. DNA polymerase I removes the RNA primer and replaces it with DNA.
B. DNA polymerase III adds free nucleotides in the direction of the replication fork.
C. Ligase joins DNA fragments together.
D. Helicase unwinds the strands by breaking hydrogen bonds.
参考答案: B
本题详细解析:
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