12、25、39、（）、67、81、96A.48 B.54 C.58 D.61 发布时间：2017-05-31 06:25 │ 来源：www.tikuol.com 题型：单项选择题 问题： 12、25、39、（）、67、81、96A.48B.54C.58D.61
题型：单项选择题 PCR是一种体外迅速扩增DNA片段的技术，下列有关PCR过程的叙述，不正确的[ ]A．变性过程中破坏的是DNA分子内碱基对之间的氢键B．复性过程中引物与DNA模板链的结合是依靠碱基互补配对原则完成C．延伸过程中需要DNA聚合酶、ATP、四种核糖核苷酸D．PCR与细胞内DNA复制相比所需要酶的最适温度较高 查看答案
题型：单项选择题 从对话后方框内的选项中选择适当的选项补全对话，并将其字母标号填入题后相应的横线上。A: Excuse me. 1_______ B: Sure. 2_______ A: Oh, could you tell me how to get to the bank? B: Sony. You'd better ask that policeman. He may know. A: Excuse me. 3_______ C: Yes. Go straight and turn right. 4_______ A: Thank you. C: 5_______ A. Can you tell me the way to the bank on Main Street? B. There's a bank on Main Street. C. The bank is on your left. D. You're welcome. E. Do you know where I can save money? 查看答案