This question is ______ easier than that one. [ ]
A. much more
B. much
C. more
D. most
答案:B
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核苷酸数为[ ]
A.7(a-m)
B.8(a-m)
C.7(a/2-m)
D.8(2a-m)
某举重运动员的体重是600N,他能够举起的物重是自己体重的2.5倍,求他能够举起杠铃的质量是多少?(g取10N/kg)