问题 名词解释

DNA聚合酶

答案

参考答案:

能够催化DNA复制和修复DNA分子损伤的一类酶,可在其催化下进行DNA体外合成反应DNA修饰酶:这类酶能对DNA分子进行一些比如3’末端加dNTP或5’末端添加/脱除磷酸基团等等的修饰T4噬菌体多核苷酸激酶:是一种能催化γ-磷酸从ATP分子转移给DNA或RNA分子的5’-OH末端的酶,它对底物分子长度没有限制。

阅读理解

When Tom finished his studies at the university (大学), he began to look around for a job. He did not know what he would like to do, but one of his uncles had worked for the government for thirty years, and he advised Tom to try to get a job of the same kind, so he went for an exam one day. He was successful, and his first job was in a large government office in London.

When Tom had been working there for a few weeks, his uncle came to visit the family one Saturday evening. He was pleased that his nephew (侄子) had got a job working for the government, and he asked him a lot of questions about it.

One of the questions he asked was, “How many people work in your department (部门), Tom?”

The young man thought for a few moments and then answered, “About half of them, Uncle Jim.”

小题1:When he graduated (毕业) from university, Tom was not ________.

A.interested in getting any information from the government

B.looking for a good-paying job with excellent hours

C.good at making decisions

D.very good at science小题2:What did Tom think of his uncle’s advice?

A.He did not like it.

B.He thought it was good

C.He refused to take it.

D.He was unable to follow it.小题3:The uncle wanted to find out ________.

A.what his nephew was doing

B.how his nephew was getting on with his job

C.whether his nephew could understand him or not

D.what his nephew had expected小题4:In fact Tom’s answer means that __________.

A.the people working in the government office were in many groups and they worked in turn

B.most of the government workers were not working hard

C.only half of the government workers went to work on time

D.the government office had more people than needed

判断题