问题 单项选择题 A1/A2型题

根据单克隆抗体的特点,以下提法哪一项是错误的()

A.特异性强 

B.高度的均一性和可重复性 

C.具有单一的生物学功能 

D.对pH、温度及盐类浓度耐受性强 

E.灵敏度高

答案

参考答案:D

解析:

单克隆抗体的理化性状高度均一,其抗原结合部位和同种型都相同,生物活性专一,特异性强,纯度高,有效抗体含量高,无效蛋白含量少易于实验标准化和大量制备。

选择题
完形填空

第二节 (共5小题;每小题2分,满分10分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

The organization,Keep Time for Children,was started in 2002 to make people realize the importance of family time on weekends,particularly for families with school age children.  51

We will try to help parents take one day off on weekends to be with their family.

52  What children want and need most is to spend time with their parents,not with toys or taking part in activities.But with more and more people working on weekends,many children of school age don’t see their parents anywhere near as often as they should.

53  The movement is designed for families of all types and sizes under increasing pressure to work on weekends.Because weekends are the very time when school age children are at home and in need of their parents.we are going to put forward a Family Day Bill(议案) to the government.  54   It is aimed to solve the problems of increasing”shift (换班的) - parenting”and of young children being left “home alone”on weekends.

55  If parents have a day off,they can spend a lot of time and energy with their children to share their happiness.

A.Keep Time for Children is now starting a movement.

B.The law is likely to make sure that parents take good care of their children.

C.Our aim is mainly to encourage parents to spend time with their children.

D.An American set up the organization.E.It would give every parent of children under the age of 16 the fight in law to a weekend day off each week.

F.Our time is the most important thing that we can give our children.

G.Parents who do not share enough time with their children are to blame.