一个由n15标记的dna分子放在没有标记的环境中培养复制4次后标记的dna分子占dna分子总数的 A.14 b.18 C.116 D Template




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tomski一个由n15标记的dna分子放在没有标记的环境中培养复制4次后标记的dna分子占dna分子总数的 a.14 b.18 coloring