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
What has cloning bypassed?
What has cloning bypassed?
admin
2014-09-27
30
问题
What has cloning bypassed?
What is cloning? Cloning is the creation of cells or whole animals using DNA from a single "parent", by passing the normal reproductive process. The clone has the same DNA as the parent.
The most common process takes DNA from one cell and puts it in a hollowed-out egg. Chemicals and electricity are then used to encourage the new DNA to fuse with the egg and develop into an embryo. This technique is called nuclear transfer.
The first cloned animal in human history is a sheep called Dolly. It is very important because it was the first mammal to be cloned using DNA taken from an adult cell. Previously, animals had only been cloned using embryo cells, which already have the potential to become a complete embryo in its own right. The big breakthrough with Dolly was to make a clone from an ordinary, adult cell.
When it comes to the question of whether cloned animals are normal and healthy, the answer is YES. Dolly is, but scientists do not yet know whether this is the exception or the rule. Some early evidence suggests that clones may have health problems and that they may age prematurely.
With the birth of Dolly, many people are worried that a human clone may be born soon. It’s possible in theory. But the technology of reproductive cloning is still in its very early stages and there is much that scientists do not understand. That’s more, human cloning is already banned by law in the United Kingdom. The former President of the United States Bill Clinton proposed banning research into producing human clones in the US for five years. Some measures have also been taken to establish international agreements banning live human clones.
选项
A、The United States
B、The United Kingdom
C、Switzerland
D、Russia
答案
B
解析
信息题。文中提到两个国家,the United Kingdom和the United States,只有英国以法律形式正式禁止克隆人,所以选B。
转载请注明原文地址:https://kaotiyun.com/show/RnRd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Whoeversaidthatvictoryhasmanyfathersanddefeatisanorphan,surelyhadneverheardoftheWorldTradeOrganization(WTO)
Ihavenoticedthatchildrenarenotevenbeingschoolinsocialgraces.AtaSundaybrunch,aclownwasmakingballoonanimals
Classicalphysicsdefinesthevacuumasastateofabsence:avacuumissaidtoexistinaregionofspaceifthereisnothingi
Decision-makingisacomplexbusinesssubjectwhichcombinesthemostcomplicatedelementsoftheoperationalandtheoreticala
【61】Inafamilywheretherolesofmenandwomenarenotsharplyseparatedandwheremanyhouseholdtasksaresharedtoagre
Childrenstartoutasnaturalscientists,instinctivelyeagertoinvestigatetheworldaroundthem.Helpingthemenjoyscienc
WhatdoyouknowaboutGeorgeDaniels?
Everyoneknowsthattaxationisnecessaryinamodernstate:【21】______it,itwouldnotbepossibletopaythesoldiersand
Whentheworldwasasimplerplace,therichwerefat,thepoorwerethin,andright-thinkingpeopleworriedabouthowtofeedt
Onlythreestrategiesareavailableforcontrollingcancer:prevention,screeningandtreatment.Lungcancercausesmoredeaths
随机试题
35岁,子宫脱垂Ⅱ度患者56岁,子宫脱垂I度轻,子宫肌瘤20周大小患者
在随机设计的方差分析中,组间差异主要反映()
经皮吸收制剂的优点
屋面坡度( )或屋面受振动时,沥青防水卷材应垂直屋脊铺贴。
甲受乙胁迫开出一张以甲为付款人,以乙为收款人的汇票,之后乙将该汇票赠与丙,丙又将该汇票背书转让与丁,以支付货款。丙、丁对乙胁迫甲取得票据一事毫不知情。根据票据法律制度的规定,下列表述中,正确的有()。
操作风险是指由于员工、过程、基础设施或技术或对运作有影响的类似因素的失误而导致亏损的风险。下列各项中,属于这种失误的是()。
仓库若按使用范围不同分,不属于此类分法的是()。
在教学中运用变式的主要目的是()。
人民警察的纪律主要有下列四个方面:政治纪律、组织纪律、()、内务纪律。
反应迅速,感情外露,遇事敏感,思想活跃,可塑性大,对环境适应性强,快人快语,善于并易于结交朋友,有很强的活动能力和语言表达能力。这种气质类型属于
最新回复
(
0
)