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
2013-06-10
23
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 "genewriter". 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 synthesizing interesting DNA.
D、a survey of scientific breakthroughs.
答案
C
解析
转载请注明原文地址:https://jikaoti.com/ti/bPsRFFFM
0
考研英语一
相关试题推荐
Overthelast20years,energysystemsandserviceshaveexpanded.Californianowmeetsitsenergyneedsusingavarietyofsour
Whatcanbeinferredfromthesentence"Sometimeslifegetstobetoomuch"(Sentence4,Paragraph3)?Whatdoesthephrase"pi
Thefactisthattheenergycrisis,whichhassuddenlybeenofficiallyannounced,hasbeenwithusforalongtimenow,andwill
Thefactisthattheenergycrisis,whichhassuddenlybeenofficiallyannounced,hasbeenwithusforalongtimenow,andwill
WiththerapidgrowthofChina’seconomyinrecentyears,China’sforeigntradehasbegunanumberofnewpragmaticandflexible
WiththerapidgrowthofChina’seconomyinrecentyears,China’sforeigntradehasbegunanumberofnewpragmaticandflexible
Whatdoestheword"theatre"(Sentence2,Paragraph1)probablymean’?Ananesthetistshouldbepresentthroughouttheoperatio
Moreandmoreresidences,businesses,andevengovernmentagenciesareusingtelephoneansweringmachinestotakemessagesorgi
Moreandmoreresidences,businesses,andevengovernmentagenciesareusingtelephoneansweringmachinestotakemessagesorgi
Moreandmoreresidences,businesses,andevengovernmentagenciesareusingtelephoneansweringmachinestotakemessagesorgi
随机试题
怎样理解共产主义事业是人类最伟大的事业?
某科室的目标是提高护理人员的业务素质,则可行的备选方案有
一高血压患者,右利手。急性发病,说话困难,只能说一两个单词,但可以听懂别人说话。最可能的诊断是
采用超声透射波法检测某桥梁工程基础桩身的完整性,已知待检桩为混凝土灌注桩,直径为1.6m,桩长30.0m,请回答下列问题。按照《公路工程基桩动测技术规程》(JTG/TF81-01—2004)规定,一根桩应设()个测试剖面。
贷款金额占抵押房地产价值的比率是指()。
案例二:2010年,张先生在国家扩大内需政策的鼓舞下,购买了一辆价值10万元的小轿车。深知交通事故风险的张先生找到甲财产险公司为其爱车投保了一份保险金额为5万元的财产险。投保后不久,张先生感觉投保金额太低,于是他又找到乙、丙财产险公司为其爱车投保了财产险,
一般资料:求助者,男性,22岁,大学生。下面是心理咨询师与求助者之间的一段咨询对话:心理咨询师:你好!请问我能为你提供什么帮助?求助者:我最近心情不好,经常感觉紧张、烦躁,不能集中注意力,饭也吃不下,觉也睡不好。心理
你认为怎样的工作和环境适合你?
旅游业是一个充满竞争的行业,相互之间比名气比服务比价格,但归根结底比的是旅游资源的_______,这才是旅游目的地的核心竞争力所在。从这一点来看,地球的南北极具备绝对的“不可替代性”,其他任何目的地都无法_______。填入画横线部分最恰当的一项是:
Shewillhavetofindsomewhereelsetowork,forshecan’t______thisloudnoiseanylonger.
最新回复
(
0
)