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
For several years, scientists have been testing a substance called interferon (干扰素), a potential wonder drug that is proving to
admin
2012-10-23
42
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,问干扰素是如何产生的。由第2段倒数第2句“The drug is produced by infecting white blood cells with a virus,”可知正确答案是C选项。
转载请注明原文地址:https://kaotiyun.com/show/Jb9O777K
0
考博英语
相关试题推荐
Thispolicygave______toprivatepropertyandledtodifferencesbetweentherichandthepoor.
InancientEgyptianpaintings,royalfiguresweredifferentiatedbymakingthemseveraltimeslargermanother.
______popularityofsubjectmatterandfrequencyofuse,thebooksonthetwomiddleshelveswillbethemosthelpfultoyou.
Althoughthereareseveralvariationsontheexactformatthatworksheetscantake,theyareallsimilarintheir______aspects
Shewasslatedtopresentanabstractofherthesisatthenationalconvention,andsospenttheholiday______.
Thesmallgroupofonlookerspresentedapatheticsightanddidnothingtohelpthedrowningchild.
Withinhoursofappearingontelevisiontoannouncetheendofconscription,PresidentJacquesChiracmovedquicklytopreventa
Iwouldliketosaythatatheoryisessentiallyanabstract,symbolicrepresentationofreality.
Whenwecreditthesuccessfulpeoplewithintelligence,physicalstrengthorgoodluck,wearemakingexcusesforourselvesbeca
Signsofdeafnesshadgivenhimgreatanxietyasearlyas1798.Foralongtimehesuccessfullyconcealeditfromallbuthismo
随机试题
普通合伙企业合伙人李某因车祸遇难,生前遗嘱指定16岁的儿子李明为其全部财产继承人。下列表述错误的是()
可利用分解尿素的支原体是
生后24小时内出现黄疸者,应首先考虑
善治:“皮里膜外之痰”的药物为
下列禁用硝酸酯类药物的是()。
医生开错医嘱护士照样执行,造成病人死亡,谁需要负责
某生产企业为居民纳税人,20i3年相关生产经营业务如下:(1)企业年初拥有房产原值5500万元.其中价值1000万元的房屋用于出租,租期两年,合同约定一次性付清两年租金200万元;医院和幼儿园占用房产原值各50万元;(2)3月末以200万元
论述晚清的教育改革。
设总体X在区间[0,θ]上服从均匀分布,X1,X2,…,Xn是取自总体X的简单随机样本,,X(n)=max(X1,…,Xn).求θ的矩估计量和最大似然估计量;
ManySoutherners______runawayslavesduringtheCivilWar.
最新回复
(
0
)