首页
登录
职称英语
For several years, scientists have been testing a substance called interfero
For several years, scientists have been testing a substance called interfero
游客
2025-03-19
17
管理
问题
For several years, scientists have been testing a substance called interferon, a potential wonder drug that is proving to be effective in treating a variety of ailments, including virus infections, bacteria infections, and tumors. To date, the new drug has provoked no negative reaction of sufficient significance to discourage its use. But in spite of its success, last year only one gram was produced in the entire world.
The reason for the scarcity lies in the structure of interferon. A species specific protein, the interferon produced from one animal species cannot be used in treating another animal species. In other words, to treat human beings, only interferon produced by human beings may be used. The drug is produced by infecting white blood cells with a virus. Fortunately, it is so potent that the amount given each patient per injection is very small.
Unlike antibiotics, interferon does not attack germs directly. Instead, it makes unaffected cells resistant to infection, and prevents the multiplication of viruses within cells.
As you might conclude, one of the most dramatic uses of interferon has been in the treatment of cancer. Dr. Hans Strander, research physician at Sweden’s famous Karohnska Institute, has treated more than one hundred cancer patients with the new drug. Among a group of selected patients who had undergone surgical procedures for advanced cancer, half were given conventional treatments and the other half were given interferon. The survival rate over a three-year period was 70 percent among those who were treated with interferon as compared with only 10 to 30 percent among those who had received the conventional treatments.
In the United States, a large-scale project supported by the American Cancer Society is now underway. If the experiment is successful, interferon could become one of the greatest medical discoveries of our time. [br] Interferon is produced by________.
选项
A、infecting viruses, bacteria, and tumors with a drug
B、infecting proteins with a virus
C、infecting white blood cells with a virus
D、infecting viruses with proteins
答案
C
解析
文中第二段倒数第二句说:“这种药物是通过一种病毒感染白细胞制造出来的。”由此看出,选项C符合文章内容。
转载请注明原文地址:https://tihaiku.com/zcyy/4003622.html
相关试题推荐
EventhoughIhavebeentoherapartmentseveraltimesbefore,Istilldon’trem
Withthepaceofchangequickening,moreandmorescientistsfindithardtokee
Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontr
Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontr
Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontr
Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontr
Britain’semissionsofgreenhousegases,blamedbymanyscientistsforcontr
Thereareseveralstepsthatcanbetaken,ofwhichthechiefoneistodemando
Forseveralyears,scientistshavebeentestingasubstancecalledinterfero
Forseveralyears,scientistshavebeentestingasubstancecalledinterfero
随机试题
Ahouseisthemostexpensivethingmostpeoplewilleverbuy.Veryfewpeop
2013年某消防单位对某一个重要的化工生产单位进行了消防设施现场检查,这次消防设
A.半开放式麻醉 B.半紧闭式麻醉 C.开放式麻醉 D.低流量紧闭麻醉
视频车辆检测器测速误差为()。A.±(1-2)% B.±2% C.±3%
肠外营养液的成分中,对维生素A有一定保护作用的是A:葡萄糖 B:钾 C:钙
衡量体质的主要指标有()A:体力 B:体格 C:感觉力 D:心态 E:知
男性,35岁,反复上腹部疼痛6年,多于每年秋季发生,疼痛多出现于餐前,进餐后可缓
商业银行建立了一套科学的授信限额管理系统,能够根据客户信息自动授予限额,则在其他
不成熟的冲突解决方式有()。 A.重建B.轮流C.选择D.逃避
下列选项中,关于农产品供给量变动的说法,正确的有()。A.当其他条件不变时,生产
最新回复
(
0
)