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
38
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
AmericanandJapaneseresearchersaredevelopingasmartcarthatwillhelpdriversavoidaccidentsbypredictingwhentheyare
Thereaxevariouswaysinwhichindividualeconomicunitscaninteractwithoneanother.Threebasicwaysmaybedescribedasth
TheInternetraisesmajorissuesandchallengesforeducation,notjustinChinabutallovertheworld.Yetitsimplycannot
Mostpeoplewhotravellongdistancescomplainofjetlag(飞行时差综合症).Jetlagmakesbusinesstravelerslessproductiveandmorepro
Mostpeoplewhotravellongdistancescomplainofjetlag(飞行时差综合症).Jetlagmakesbusinesstravelerslessproductiveandmorepro
Itwasnot"thecometofthecentury"expertspredicteditmightbe.However,Kohoutekhasprovidedabonanzaofscientificinfo
Everyoneknowsthattaxationisnecessaryinamodernstate:【21】______it,itwouldnotbepossibletopaythesoldiersand
Mr.Smith,apassengeronthetranscontinentaltrain,appearedbeforethejudge.Apoliceofficerclaimedhehadattemptedto【
Onlythreestrategiesareavailableforcontrollingcancer:prevention,screeningandtreatment.Lungcancercausesmoredeaths
Whathascloningbypassed?
随机试题
简述杨炎两税法的主要内容及其历史意义。(华东师范大学1999年中国通史真题;南京农业大学2002年中国通史真题;南京大学2003年中国古代史真题;华东师范大学2004年中国古代史真题;湖南师范大学2005年中国古代史真题)
女性,29岁,双手发作性发凉,麻木2年,渐加重。查体:双手手指指端发绀,发凉,双侧桡动脉搏动好。应考虑的诊断是
阿司匹林与对乙酰氨基酚通过如下反应可以得到新药
场景某城市排水站工程施工,需要进行沉井施工。于是负责人根据地形、土质、适用方式等因素,决定采用阶梯形沉井施工,在稳定的土层中,采用了排水开挖下沉的方法来进行沉井下沉,最后对沉井进行封底。根据场景,回答下列问题。当水文地质条件不宜采用大开挖建造泵站及
下列说法正确的有()。
A公司与B公司均为增值税一般纳税人。适用的增值税率均为17%。2009年为了各自企业战略目标的实现,A公司与B公司进行资产置换。似定该项交换具有商业实质且公允价值能够可靠地计量。交换的相关资料如下:(1)A公司换出:固定资产(2009年初购入的机
Forthispart,youareallowedtowriteanEnglishcompositionaccordingtothefollowingtitleTheImpactofInformationExplos
下列关于客体与物质形态关系的观念正确的是()。
设有下列二叉树:对此二叉树后序遍历的结果是
いらっしゃいませ。______あがってください。
最新回复
(
0
)