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
At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th centu
At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th centu
admin
2011-01-02
38
问题
At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th century. Born with an extremely rare and usually fatal disorder that left her without a functioning immune system (the "bubble-boy disease", named after an earlier victim who was kept alive for years in a sterile plastic tent), she was treated beginning in 1990 with a revolutionary new therapy that sought to correct the defect at its very source, in the genes of her white blood cells. It worked. Although her last gene-therapy treatment was in 1992, she is completely healthy with normal immune function, according to one of the doctors who treated her, W. French Anderson of the University of Southern California. Researchers have long dreamed of treating diseases from hemophilia to cancer by replacing mutant genes with normal ones. And the dreaming may continue for decades more. "There will be a gene-based treatment for essentially every disease," Anderson says, "within 50 years. "
It’s not entirely clear why medicine has been so slow to build on Anderson’ s early success. The National Institutes of Health budget office estimates it will spend $ 432 million on gene-therapy research in 2005, and there is no shortage of promising leads. The therapeutic genes are usually delivered through viruses that don’ t cause human disease. "The virus is sort of like a Trojan horse," says Ronald Crystal of New York Presbyterian/Weill Cornell Medical College. "The cargo is the gene. "
At the University of Pennsylvania’s Abramson Cancer Center, immunologist Carl June recently treated HIV pa tients with a gene intended to help their cells resist the infection. At Cornell University, researchers are pursuing gene-based therapies for Parkinson’s disease and a rare hereditary disorder that destroys children’ s brain cells. At Stanford University and the Children’ s Hospital of Philadelphia, researchers are trying to figure out how to help patients with hemophilia who today must inject themselves with expensive clotting drugs for life. Animal experiments have shown great promise.
But somehow, things get lost in the translation from laboratory to patient. In human trials of the hemophilia treatment, patients show a response at first, but it fades over time. And the field has still not recovered from the setback it suffered in 1999, when Jesse Gelsinger, an 18-year-old with a rare metabolic disorder, died after receiving an experimental gene therapy at the University of Pennsylvania. Some experts worry that the field will be tarnished further if the next people to benefit are not patients but athletes seeking an edge. This summer, researchers at the Salk Institute in San Diego said they had created a "marathon mouse" by implanting a gene that enhances running ability; already, officials at the World Anti-Doping Agency are preparing to test athletes for signs of "gene doping". But the principle is the same, whether you’re trying to help a healthy runner run faster or allow a muscular-dystro-phy patient to walk. "Everybody recognizes that gene therapy is a very good idea," says Crystal. "And eventually it’s going to work. "
Which of the following is true according to the text?
选项
A、Ashanthi needs to receive gene-therapy treatment constantly.
B、Despite the huge funding, gene researches have shown few promises.
C、Therapeutic genes are carried by harmless viruses.
D、Gene-doping is encouraged by world agencies to help athletes get better scores.
答案
C
解析
文章第二段对于基因治疗的方式的解释是用于治疗的基因通过“viruses that don’t cause human disease”进入体内,就好像“特洛伊木马”一样,由此可见,这些病毒是无害的。因此正确答案为C。
转载请注明原文地址:https://kaotiyun.com/show/QdHd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
YouthEmancipationinSpainTheSpanishGovernmentissoworriedaboutthenumberofyoungadultsstilllivingwiththeirpa
HowaTerribleBattleHelpedtoChangeEuropeNinetyyearsagoonasunnymorninginNorthernFrance,somethinghappenedtha
HowaTerribleBattleHelpedtoChangeEuropeNinetyyearsagoonasunnymorninginNorthernFrance,somethinghappenedtha
TheScienceofPersuasionIfleadershipconsistsofgettingthingsdonethroughothers,thenpersuasionisoneoftheleader
SymptomsofPervasiveAnti-IntellectualismAmericanstodaydon’tplaceaveryhighvalueonintellect.Ourheroesareathl
SymptomsofPervasiveAnti-IntellectualismAmericanstodaydon’tplaceaveryhighvalueonintellect.Ourheroesareathl
TrafficJams—NoEndinSight1.Trafficcongestion(拥堵)affectspeoplethroughouttheworld.Trafficjamscausesmogindozens
Inordertoimproveourstandardofliving,wehavetoaccelerateproduction.
A.humanisbornwithacertainpersonalityB.howthepersonalityandbehaviorareformedC.willexperienceintellectualdevel
随机试题
识读φ25H7/m6的含义。
心悸病位在心,其发病与哪些脏腑功能失调有关
患者,男,50岁。因“口渴,多饮伴夜尿增多1个月”来诊。1个月前患者无明显诱因出现口渴,多饮,每日饮水约2500ml,伴夜尿增多,由原来的0~1次/夜,增加至3~4次/夜,无明显易饥、多食、体重下降,无烦躁、易怒、怕热、多汗、心悸。提示:空腹血浆葡萄糖
箱涵顶进挖运土方时,应按照侧刃脚坡度及规定的进尺()。
根据现行企业所得税法的规定,税前可以享受加计扣除优惠的情形有()。
华达会计师事务所受聘为京发公司发行股票出具评估报告,按规定华达会计师事务所及其为该报告出具审计意见的注册评估师,在()内,不得买卖该种股票。
下列文种必须以领导人签发日期为成文日期的是()。
办公室自动化(OA)是计算机的一项应用,按计算机应用的分类,它属于()。
Writealetterofapplicationtotheadvertiseraskingforthevacancyoftranslator.Yourlettershouldbenolessthan100wor
BonAppetiteA)Wealllovethefoodwegrowupon,butwealsoseekadventureinthefoodwehavenevertasted.Ahugelypopular
最新回复
(
0
)