题目内容

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. 1/4            B. 1/8            C. 1/16          D. 1/24

 

【答案】

B

【解析】略

 

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