首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
For several years, scientists have been testing a substance called interferon(干扰素), a potential wonder drug that is proving to b
For several years, scientists have been testing a substance called interferon(干扰素), a potential wonder drug that is proving to b
admin
2017-03-25
28
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.
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
细节题,问于扰素是如何产生的。根据第二段倒数第二句“The drug is produced by infecting white blood cells with a virus.”,正确答案是C。
转载请注明原文地址:https://kaotiyun.com/show/iaGO777K
0
考博英语
相关试题推荐
Thestudyofgeneticshasgivenrisetoaprofitablenewindustrycalledbiotechnology.Asthename【C1】______,itcombinesbiolo
TwentyyearsagotherewaspanicinCupertino,Calif.OnlyaweekremainedbeforetheteamofwhizkidsdesigningApple’sradica
Everynightshelistenedtoherfathergoingaroundthehouse,lockingthedoorsandwindows.Shelistened:thebackdoorclosed
Theconceptofobtainingfreshwaterfromicebergsthataretowedtopopulatedareasandaridregionsoftheworldwasoncetrea
Theeconomicsituation(willimprove)giventhatthereis(forecasttobe)lessunemploymentand(closures)than(inpreviousye
Ifyouareafanofsciencefiction,you’venodoubtencounteredthetermnanotechnology,Yetoverthepastyearalso,aseries
Directions:Doyouagreeordisagreewiththefollowingstatement?Peopleneversatisfiedwithwhattheyhave.Theyalwayswant
Ifyoudevelopareputationforbeingabletokeepsecretsotherswill_____towardsyouwithusefulnewsandgossip.
Somepeopleprefertoplanactivitiesfortheirfreetimeverycarefully.Otherschoosenottomakeanyplansatallfortheirf
Engineeringstudentsaresupposedtobeexamplesofpracticalityandrationality,butwhenitcomestomycollegeeducationIam
随机试题
我国教育方针的核心和基本内容是()。
专家:上市公司的董事会通常由大股东组成,小股东因股权小不能进入董事会,因此小股东的利益很容易受到大股东的侵犯。设立独立董事制度,是希望独立董事能够代表小股东,形成对大股东的制衡。但独立董事由公司董事会聘请并支付报酬,这就形成了独立董事与公司董事会在经济上的
工程量大、施工周期长的大型管网工程、高炉砌筑工程等,这些工程可酌情划为( )。
业主可向承包商进行索赔的情形包括()。
施工图预算中适应于市场经济体制的预算编制方法是( )。
在计算下列资金成本时,()可以不用考虑筹资费用的影响。
在对成本进行分类,以便归集责任中心的成本时,所确定的不可控成本都是固定成本。()
下列关于和解的表述中,符合企业破产法律制度规定的有()。
软件设计中模块划分应遵循的准则是()。
A、Theycallattentiontothecontributionofwomen.B、Theyhonorthesocialandpoliticalvictoriesofwomen.C、Theycallattent
最新回复
(
0
)