某DNA分子共有a个碱基,其中含胞嘧啶m个,则该DNA分子复制3次,需要

某DNA分子共有a个碱基,其中含胞嘧啶m个,则该DNA分子复制3次,需要游离的胸腺嘧啶脱氧核苷酸数为            

A.7(a-m)       B.8(a-m)      C. 7(     )        D.8(2a-m)

答案

C

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