问题 单项选择题 B型题

降低异源性,有利于人体应用的是()。

A.抗体融合蛋白

B.双特异性抗体

C.人源化抗体

D.小分子抗体

E.抗体库技术

答案

参考答案:C

解析:人源化抗体、小分子抗体、抗体融合蛋白、双特异性抗体及抗体库技术均为基因工程抗体技术。人源化抗体保留了亲本鼠单克隆抗体的亲和力和特异性,降低了异源性,有利于人体应用。小分子抗体的分子量小,可在大肠杆菌等原核细胞表达,在人体内穿透力强,有利于疾病的治疗。抗体融合蛋白将抗体分子片段与其他蛋白融合,可将生物活性物质导向靶细胞特定部位,所谓"生物导弹"。双特异性抗体能同时结合两种抗原,因而可介导标记物与靶抗原结合或效应因子定位于靶细胞,在免疫学检测中可简化操作步骤,提高检验质量。

阅读理解

                                                                 SELF STUDY TIPS

     However difficult you find it to arrange your time, it will pay off in the long run if you set aside a

certain part of the day for studying-and stick to it. __1__ But don't forget to make sure that you

have enough left for recreational activities or simply to be "with" yourself: reading a novel or watching

a television programme.

     As part of your weekly schedule, it is also advisable to consider exactly what you have to do in that

week, and make sure that you handle the most significant tasks first. __2__

     On a physical level, make sure you have an area or space for studying. __3__ If you always study

in the same place, preferably a room of your own, you will find it easier to adjust mentally to the activity

when you enter that area. You should have everything that you might need at hand.

     Make sure that all the physical equipment that you use, such as a desk, chair etc. is at good height

for you. If you use a personal computer, there are plenty of guidelines available from the movement on

angles, lighting and the like.   __4__

     If you are working on topic your teacher has set, but finding it hard to concentrate, it may be that you

actually need to take your mind right off it for a period of time.  __5__ After a period away from the

test, having not thought about it at all, you may return to it refreshed and full of ideas.

A. It's wise to leave the easier or less urgent areas of your work until later.

B. It's all too easy to read something and then forget where it came from.

C. Consult these and avoid the typical student aches and pains.

D. "Airing the mind" can work wonders sometimes.

E. Make use of equipment that is available to you.

F. It is best to make a weekly schedule.

G. Don't do it just anywhere.

单项选择题