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
23
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
AccordingtorecentUnitedStatesDepartmentofAgriculture(USDA)projections,thecountrywillseeasharpdropinmeatconsumpt
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
Someanimalsarewidelyusedinexperiments______(尽管有些人对此表示反对).
ThePeakTimeforEverythingCouldyoupackmoreintoeachdayifyoudideverythingattheoptimaltime?Agrowingbodyof
Theinnervoiceofpeoplewhoappearunconsciouscannowbeheard.Forthefirsttime,researchershavestruckupaconversation
Everybodywantstogetwealthy.Intoday’s【B1】______world,makingmoneyorbecomingwealthysymbolizesaperson’ssuccessandc
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimatechange.TheEarthwarms,polarice【B1】______,andt
Aleadingbiologisthascomparedthephysiology(生理学)offlightedspecieswiththerepresentationsofspiritualandmythicalcreat
随机试题
女性患者,25岁,支气管哮喘,发作时有发绀、大汗现象,为缓解其呼吸困难,护士应
被宣告为限制行为能力人的间歇性精神病人,在其精神正常时所立的遗嘱属于()
Forthispart,youaresupposedtowritealetterin100-120wordsaccordingtothefollowingsituations.你是Jane。写信给你的朋友Juli
左下肢深静脉血栓,如不及时治疗.最常见的并发症是
深圳光明眼镜公司(4402913091)委托深圳圳旺国际贸易公司(4402911616)进口一批镜框材料,装载该货物的运输工具于2004年9月13日申报进境,次日由深圳巨龙报关公司向深圳海关申报。“征免性质”栏应填()。
当实际()发生较大变化,工厂的生产能力随之变化。
下列有关收入确认的表述中。符合准则规定的有()。
世界近代旅游业的创始人是英国人托马斯·库克,银行家陈光甫先生开创了中国近代旅游业。()
第一段中提到“植物生物钟”,第二段提到“植物周期行为”、“生理节律”和“异步个体”。对文中这四个概念的理解,正确的一项是()从全文看借助萤火虫的基因的目的是什么?下面的表述中最恰当的一项是()
设A是n阶实矩阵,有Aξ=λξ,ATη=μη,其中λ,μ是实数,且λ≠μ,ξ,η是n维非零向量,证明:ξ,η正交.
最新回复
(
0
)