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
47
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
【M1】TheeconomicgrowththatmanynationsinAsiaandincreasinglyAfricahaveexperiencedoverthepastcoupleofdecadeshast
Ithasbeenrevealedthatnearlyoneinfivedegreecourseshasbeen______sincethetriplingoftuitionfeesto£9,000ayear.
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,therefore,thechoiceofan【C1】______shouldbemade
TwentyyearsagotherewaspanicinCupertino,Calif.OnlyaweekremainedbeforetheteamofwhizkidsdesigningApple’sradica
Asurveywascarriedoutonthedeathrateofnew-bornbabiesinthatregion,______weresurprising.
IncomeinequalityintheUnitedStatesremainedrelativelystableforaperiodofnearlyfortyyears.Beginninginthe1970’s,h
Linguistshaveunderstoodfordecadesthatlanguageandthoughtarecloselyrelated.Humansconstructrealityusingthoughtand
Theintellectually_____enterpriseofsciencedependsonfreecommunication.
He_____interruptedmebyaskingmanyirrelevantquestions.
OnehundredandthirteenmillionAmericanshaveatleastonebank-issuedcreditcard.Theygivetheirownersautomaticcreditin
随机试题
设函数anxn的收敛半径为3,则级数nan(x-1)n+1的收敛区间为_______.
某碱性药物的pH值为9.8,如果增高尿液的pH值,则此药在尿中
依据《刑事诉讼法》的相关规定,下列有关死刑复核程序的说法中,不正确的是哪项?
根据服务对象的不同,可将空调分为()。
购销合同包括()。
说起乡愁,那是一种_________的情怀,住在心中的故乡常常鲜活在那里。故乡是安放你的灵魂、温暖你的寂冷的地方,是接纳你的疲惫、抚慰你的忧伤的地方。翻开一页页被繁忙弄乱的过往,记忆中的余香总___________于儿时的故乡。 依次填入划横线部分最恰
下列关于宪法解释体制的表述,正确的是()。
Theideaseemssortoffoolish,justanotherexercisetrick.Standforafewminutesonaplatformthatvibrates.Getoffandtr
ThePacificnorthwestisfavoredwitha______climatelikethatofBritain.
Farmerscanmakegooduseofsomelandwhileotherareasnearbyarelessattractive,oreven______them.
最新回复
(
0
)