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
8
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
WhenGeorgeW.BushdeliveredhisStateoftheUnionAddressthispastJanuar
FallingThroughtheCracks(被忽视)DanielSpangenburger,a
Inmanywayswecanallbeencouragedtolearnanotherlanguage.Althoughit
Americanwomenwilloccasionallywearshortskirts,sleevelessshirts,makeu
"Avoidtherush-hour"mustbethesloganoflargecitiestheworldover,whe
我国高程系统采用正常高系统,地面点的正常高的起算面是()A:似大地水准面B:大
检查线的方向应尽量与主测深线垂直,分布均匀,并要求布设在较平坦处,能普遍检查主测
89.电抗器的作用是抑制高次谐波,降低母线残压。
证券交易中的委托单,如经客户和证券经纪商双方签字和盖章,性质上就相当于()。A:
货币市场工具与资本市场工具的主要区别在于()。A.成本不同 B.期限不同
最新回复
(
0
)