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
考研
In a science-fiction movie called "Species", a mysterious signal from outer space turns out to describe the genome of an unknown
In a science-fiction movie called "Species", a mysterious signal from outer space turns out to describe the genome of an unknown
admin
2009-04-27
79
问题
In a science-fiction movie called "Species", a mysterious signal from outer space turns out to describe the genome of an unknown organism. When the inevitable mad scientist synthesizes the DNA described by the instructions, the creature he breeds from it turns out to resemble Natasha Henstridge, an athletic actress. Unfortunately, the alien harbors within her delicate form the destructive powers of a Panzer division, and it all ends badly for the rash geneticist and his laboratory.
Glen Evans, chief executive of Egea Biosciences in San Diego, California, acknowledges regretfully that despite seeking his expert opinion—in return for which he was presented with the poster of the striking Mr. Henstridge that hangs on his office wall—the producers of "Species" did not hew very closely to his suggestions about the feasibility of their script ideas. Still, they had come to the right man. Dr Evans believes that his firm will soon be able to create, if not an alien succubus, at least a tiny biological machine made of artificial proteins that could mimic the behavior of a living cell.
Making such proteins will require the ability to synthesize long stretches of DNA. Existing technology for synthesizing DNA can manage to make genes that encode a few dozen amino acids, but this is too short to produce any interesting proteins. Egea’s technology, by contrast, would allow biologists to manufacture genes wholesale. The firm’s scientists can make genes long enough to encode 6,000 amino acids. They aim to synthesize a gene for 30,000 amino acids within two years.
Using a library of the roughly 1,500 possible "motifs" or folds that a protein can adopt, Egea’s scientists employ computers to design new proteins that are likely to have desirable shapes and properties. To synthesize the DNA that encodes these proteins, Egea uses a machine it has dubbed the"
As Egea extends the length of DNA it can synthesize, Dr. Evans likens this device to a word processor for DNA, on which you can type in the sequence of letters defining a piece of DNA and get that molecule out.
As Egea extends the length of DNA it can synthesize, Dr. Evans envisages encoding not just proteins, but entire biochemical pathways, which are teams of proteins that conduct metabolic processes. A collection of such molecules could conceivably function as a miniature machine that would operate in the body and attack disease, just as the body’s own defensive cells do. Perhaps Dr. Evans and his colleagues ought to get in touch with their friends in Hollywood.
选项
A、about a new application of computers.
B、a review of a science-fiction movie.
C、about the synthesizing interesting DNA.
D、a survey of scientific breakthroughs.
答案
C
解析
题干问:"本文主要谈论的是…"。综观全文,本文主要谈论的是"关于合成有用的DNA"。而选项"关于一种计算机的新应用","科幻电影的评论"以及"科学突破的纵览"皆不符合题意。
转载请注明原文地址:https://kaotiyun.com/show/uFa4777K
0
考研英语一
相关试题推荐
Beautyhasalwaysbeenregardedassomethingpraiseworthy.Almosteveryonethinksattractivepeoplearehappierandhealthier,h
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubtitlefromthelistA—Gforeachnumberedpara
Writeanessaybasedonthefollowinggraphs.Inyouressay,youshould1)interpretthegraphs,and2)giveyourcomments
Howlongyoulivehasalottodowithyourenvironmentandlifestyle,butexceptionallongevitymayhaveevenmoretodowithy
Adealisadeal—except,apparently,whenEntergyisinvolved.Thecompany,amajorenergysupplierinNewEngland,provokedj
RunningfortheofficeofthePresidentoftheUnitedStatesisexceptionallyarduousandshouldnotbeundertakenbythe【C1】___
RunningfortheofficeofthePresidentoftheUnitedStatesisexceptionallyarduousandshouldnotbeundertakenbythe【C1】___
TheessentialfunctionsoftheUNaretomaintaininternationalpeaceandsecurity,todevelopfriendlyrelationsamongnations,
TheessentialfunctionsoftheUNaretomaintaininternationalpeaceandsecurity,todevelopfriendlyrelationsamongnations,
America’srecenthistoryhasbeenapersistenttilttotheWest—ofpeople,ideas,commerceandevenpoliticalpower.California
随机试题
当今世界各国当事人普遍选择的解决争议的基本方式是诉讼和()
如图所示的顺层岩质边坡,已知每延米滑体作用在桩上的剩余下滑力为900kN,桩间距为6m,悬臂段长9m,锚固段8m,剩余下滑力在桩上的分布按矩形分布,试问抗滑桩锚固段顶端截面上的弯矩是下列哪个选项?()
某公司拟从国外进口一套机电设备,重量1500吨,离岸价为400万美元。其他有关费用参数为:国外运费标准为360美元/吨;海上运输保险费费率为0.266%;银行财务费费率为0.5%;外贸手续费费率为1.5%;关税税率为22%;进口环节增值税税率为17%;人民
从唯物论角度看,坚持破除一切妨碍发展的观念和体制机制弊端,这是因为()。
据1999年所作的统计,在美国35岁以上的居民中,10%患有肥胖症。因此,如果到2009年美国的人口将达到4亿的估计是正确的,那么,到2009年美国35岁以上患肥胖症的人数将达到2千万。以下哪项如果为真,最能削弱题干的推测?
下面叙述正确的是
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforregularphysicalactivity.Itrequiresnoequipment,e
Youwillnowlistentopartofaconversation.Youwillthenbeaskedaquestionaboutit.Afteryouhearthequestion,giveyou
Mostearthquakesoccurwithintheupper15milesoftheearth’ssurface.Butearthquakescananddooccuratalldepthstoabout
A、15%.B、25%.C、27%.D、73%.D选项表明本题考查数字。短文中提到有多少美国公司认为办公室养宠物是有益的,其中提到,AstudyofmajorU.Scompaniesshowedthat73%foundoffice
最新回复
(
0
)