题目

1952年，赫尔希和蔡斯所作的T2噬菌体侵染大肠杆菌的实验中，35S和32P这两种同位素标记的物质是（   ） A. 35S标记DNA分子，32P标记蛋白质分子      B.蛋白质分子 C. 35S标记蛋白质分子，32P标记DNA分子       D. DNA分子 答案：C用所给词的适当形式填空。【小题1】The weather in Wuhan is      (hot) than that in Beijing in summer.【小题2】Do you know when Clindy can finish       (write)the book?【小题3】It’s good for your health     (walk )after supper.【小题4】Are there any       (different)between the twin sisters?【小题5】I came into the classroom      (quiet)