含有100个碱基对的一个DNA分子片段,内含60个胸腺嘧啶,如果连续

 含有100个碱基对的一个DNA分子片段,内含60个胸腺嘧啶,如果连续复制3次,则需要游离的胞嘧啶脱氧核苷酸                                            

A. 60           B. 120         C. 280                D. 420

答案

C

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