RNA, the single-stranded precursor to DNA, normally expands one nucleic base at a time, growing sequentially like a linked chain.

DNA的单链前体分子，一般一次延伸一个碱基，就像延长的锁链。

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RNA, the single-stranded precursor to DNA, normally expands one nucleic base at a time, growing sequentially like a linked chain.

DNA的单链前体分子，一般一次延伸一个碱基，就像延长的锁链。

youdao