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
2025-04-05
9
管理
问题
For several years, scientists have been testing a substance called interferon(干扰素), 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 of 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 powerful 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 Karolinska Institute, has treated more than one hundred cancer patients with the new drug. Among a group of selected patients who has undergone surgical procedures for advanced cancer, 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 have 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] What effect does interferon have on infection?
选项
A、It provokes a negative reaction.
B、It keeps healthy cells from becoming infected.
C、It causes healthy cells to grow.
D、It attacks viruses.
答案
B
解析
细节题。解题点在第三段第二句“Instead,it makes unaffected cells resistant to infection,and prevents the multiplication of viruses within ceils.”意思指的是,干扰素的作用是让未受侵袭的细胞具有抗感染性。而unaffected cells和healthy cells表达同样的意思,所以正确答案是B。
转载请注明原文地址:https://tihaiku.com/zcyy/4027006.html
相关试题推荐
Severalexpertshavebeencalledintoplan______forboating,tennis,refreshme
Scientistshavelongunderstoodthatsupermassiveblackholesweighingmilli
Scientistshavelongunderstoodthatsupermassiveblackholesweighingmilli
Accordingtosociologists,thereareseveraldifferentwaysinwhichaperso
Accordingtosociologists,thereareseveraldifferentwaysinwhichaperso
Accordingtosociologists,thereareseveraldifferentwaysinwhichaperso
Findingsfromseveralstudiesoncorporatemergersandacquisitionsduringt
Whensolidchangestoliquid,it______heatfromallsubstancesnearitandthis
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
随机试题
HowtoKeepYourNewYear’sResolutions[A]AbouthalfofallAme
[originaltext]JapanandGermanyhavetheworld’soldestpopulations,butne
【教学过程】 (一)实物导入 教师出示实物“红线”学生观察。 教师提问:同学们观察一下老师手中的红线,猜猜这是做什么用的?你们的新年礼物都收到过什么
责任保险的保险标的是指被保险人在法律上应负的()。A.民事损害造成的财产损害
利率是各国发展国民经济的重要杠杆之一,关于利率的说法正确的是()。A:利率的高
小青龙汤中主要起温肺散寒化饮作用的配伍药物是A.麻黄、桂枝 B.桂枝、细辛
我国对申请合格境外投资者资格所应具备的条件包括()。 ①财务稳健,资信良好
关于中效胰岛素的用法叙述不正确的是A.每天一次早饭前给药或是每天两次给药 B.
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
A.恶寒发热 B.但寒不热 C.身热不扬 D.寒热往来 E.长期低热半表
最新回复
(
0
)