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
2016-11-25
34
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 patients 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-dystrophy 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/2hWd777K
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
Walking—likeswimming,bicyclingandrunning—isanaerobicexercise,(31)buildsthecapacityforenergyoutputandphysicalend
Walking—likeswimming,bicyclingandrunning—isanaerobicexercise,(31)buildsthecapacityforenergyoutputandphysicalend
Howmanylanguagesareusedthroughouttheworldtoday?
Howmanylanguagesareusedthroughouttheworldtoday?
Howmanylanguagesareusedthroughouttheworldtoday?
Howmanytheoriesdoestheauthormention?Accordingtothepassage,whydoeswatertravelthroughplantsinunbrokencolumns?
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
随机试题
内脏痛的特点是有牵涉痛,定位准确。
下列哪种情况不引起转氨酶增高
A.呼吸道感染B.胸膜炎C.喉部疾病D.肺结核E.支气管哮喘咳嗽伴哮鸣音
关于非法吸收公众存款罪,下列说法正确的是:()
张某在其18岁生日当天的宴会上,因酒后过失致同学杨某(17周岁)重伤。案发后3个月,张某被起诉至人民法院。关于本案的程序,下列哪些说法是正确的?()
某工业企业2014年实现会计利润150万元,计入成本、费用的实发工资总额为40万元,拨缴职工工会经费0.8万元,支出职工福利费6.8万元、职工教育经费1.5万元,假定不存在其他纳税调整事项,该企业2014年度应纳所得税额是()万元。
有一项经济且有效的信息收集方法,它通过对于工作相关的现有文献进行系统的分析来获取工作信息,这种工作分析方法称为()。
采用权益法核算时,下列各项不会引起投资企业长期股权投资账面价值发生增减变动的是()。
为了让历法更好地配合天象和自然季节,用以安排农业生产,古人还创制了“二十四节气”。从史料来看,中国最早出现的是“二分”与“二至”。
Thereareabout______universities,includingtheOpenUniversityinBritain.
最新回复
(
0
)