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
DNA sequences from some of the most deadly pathogens(病原体)known to man can be bought over the Internet, the Guardian has discover
DNA sequences from some of the most deadly pathogens(病原体)known to man can be bought over the Internet, the Guardian has discover
admin
2014-12-31
68
问题
DNA sequences from some of the most deadly pathogens(病原体)known to man can be bought over the Internet, the Guardian has discovered.
In an investigation which shows the ease with which terrorist organizations could obtain the basic ingredients of biological weapons, this newspaper obtained a short sequence of smallpox(天花)DNA. The deadly virus has existed only in laboratories since being eradicated from the world’ s population 30 years ago.
The DNA sequence of smallpox, as well as other potentially dangerous pathogens such as poliovirus and 1918 flu are freely available in online public databases. So to build a virus from scratch, a terrorist would simply order
consecutive
lengths of DNA along the sequence and glue them together in the correct order. This is beyond the skills and equipment of the kitchen chemist, but could be achieved by a well-funded terrorist with access to a basic lab and PhD-level personnel.
One study estimated that because most people on the planet have no resistance to the extinct virus, an initial release which infected just 10 people would spread to 2.2 million people in 180 days.
The DNA sample we ordered had, at our request, three small modifications to render it harmless before it was sent by post to a residential address in London. The company has conceded that it was not aware it was sending out a sequence of modified smallpox DNA.
There are legitimate reasons for researchers to buy lengths of DNA from pathogens, for example in developing treatments or vaccines against them. However, because this industry is so new and unregulated, companies are selling custom-made DNA without making thorough checks on the identities of the people who are placing the orders or what the sequences are.
Of the four main companies operating in the UK, none currently screens all their DNA orders. There are 39 companies operating in North America and not all screen their orders.
The company whose DNA Samples we ordered______.
选项
A、did not knon what is really sent out then
B、has admitted it knew what it was really doing
C、was a new one in this industry
D、sent out the sample DNA to an office in London
答案
A
解析
细节题。文章倒数第三段最后指出The company has conceded that it wasnot aware it was sending out a sequence of modified smallpox DNA.意为这家公司承认当时并没有意识到送出的是一段改变了序列的天花DNA。由此可判断这家公司并不知道当时发生了什么,现在才知道。故答案A正确,B错误。选项C在文中没有提及:根据…sent by post to a residential address in London…可排除选项D。故选A。
转载请注明原文地址:https://kaotiyun.com/show/SDq7777K
0
大学英语四级
相关试题推荐
Researchonfriendshiphasestablishedanumberoffacts,someinteresting,someevenuseful.Didyouknowthattheaveragestud
A、Theygetpaidtoworkfortheirdegree.B、Theyhelpalotinresearchandinteachingundergraduates.C、Theyenrollingraduat
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
A、Becauseshedoesn’twanttogowithoutanyotherwoman.B、Becauseshedoesn’twantherplanoflosingweightinvein.C、Becaus
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreadersarenotespeciallysmart.Anewstudybyres
A、Humanbeingssuddenlyappearbeforethem.B、Someunexpectedanimalsstepintothebush.C、Thereareloudnoisescomingfromma
ThePeakTimeforEverythingA)Couldyoupackmoreintoeachdayifyoudideverythingattheoptimaltime?Agrowingbodyofre
Aleadingbiologisthascomparedthephysiology(生理学)offlightedspecieswiththerepresentationsofspiritualandmythicalcreat
ThefloodofwomenintothejobmarketboostedeconomicgrowthandchangedU.S.societyinmanyways.Manyin-homejobsthatuse
随机试题
下列哪一或哪些选项的表述可以成立?()
喷涂时在喷枪内至少存在()气。
标定高锰酸钾标准滴定溶液的基准物质有()。
企业总分类会计科目设置的基础是
事物阴阳属性错误表述的一项是
关于流行性脑脊髓膜炎的叙述,错误的是
反佐药的作用包括
关于地铁车站留置施工缝位置说法,正确的有()。
下列情形中,纳税人应进行土地增值税清算的是()。
中国近代史是一部屈辱史,又是一部抗争史。先进的中国人为了寻求救国救民的真理,不断向西方学习,开始了中国的近代化。为中国的近代化开辟了道路的历史事件是()。
最新回复
(
0
)