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
2015-01-31
36
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.
It can be inferred from the last paragraph that_____.
选项
A、no companies check the DNA orders at present
B、there are only 39 companies in this industry operating in America
C、some measures must be taken to regulate this industry
D、video cameras must be installed to monitor the companies and the orders
答案
D
解析
推断题。作者在最后一段主要讲在英国和北美从事此行业的各大公司并没有对订购DNA序列的订单进行监控,由此可推断出可以安装摄像机来监督这些公司和订单。故选D。
转载请注明原文地址:https://kaotiyun.com/show/5kq7777K
0
大学英语四级
相关试题推荐
A、Buyingapaintinginthegallery.B、Commentingonapicture.C、Talkingaboutadisaster.D、Findingaplaceinthegallery.B行动
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
AaronSwartz.thebrilliantyoungsoftwareprogrammerandInternetactivistwhoinspiredaweandreverence(尊敬)fromleadingfigur
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
随机试题
每一个完整的油田开发方案,都可根据油田的地质情况及流体力学的计算和开采的工艺设备,得出该开发方案下的()指标。
管理者扮演的信息角色包括()
求
如何正确认识和处理好改革、发展、稳定三者之间的关系?
护士张某,不慎将热水溅在足背上,局部灼痛感,皮肤潮红,无水疱,立即用冷毛巾行局部冷敷。其主要作用是
患者男性,68岁,主因“反复咳嗽、咳痰30年,活动后气短15年,右下肢水肿3年”入院,患者已反复住院5次。此次因上呼吸道感染后出现呼吸困难加重,家人发现其活动减少,神志恍惚。到门诊就诊入院。查血气分析(未吸氧时)pH7.30,PaCO289mmHg,PaO
中国公民出入境申办护照应履行下列手续()。
成就动机可以区分为力求成功与避免失败两种倾向,力求成功者的成就动机水平【】
教师要耐得住寂寞、清贫。教师要守住这片净土。你为什么选择教师这个行业?参加教师招考进入教师队伍你的动机是什么?你觉得做教师的伟大之处在哪里?
西周统治者主张“以德配天”,其“德”的要求主要包括()。
最新回复
(
0
)