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
2010-07-06
77
问题
What has cloning bypassed?
What is cloning? Cloning is the creation of cells or whole animals using DNA from a single "parent", bypassing 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 was a sheep called Dolly. It was 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 complete embryos in their own right. The big breakthrough with Dolly was that a clone was made 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. What’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 U. S. for five years. Some measures have also been taken to establish international agreements banning live human clones.
选项
A、The nuclear transfer.
B、The process of taking DNA
C、The normal reproductive process.
D、The creation of cells.
答案
C
解析
转载请注明原文地址:https://www.kaotiyun.com/show/JqDd777K
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
Aslongasherparentscanremember,13-year-oldKatieHarthasbeentalkingaboutgoingtocollege.Hermother,Tally,afinanc
Howmanyfactorscouldshapepublicopinion,asmentionedinthetext?Itisobviousthattheopinionoffamouspeople______.
WhatbreaksupIndonesians’extendedfamilyliving?
Harvard答案对应于独白第五句:Healsotaughttherefroml954until1969,其中there就是指上一句中的HarvardUniversity.独白中只出现了这一个大学名,考生要注意的还是信息出现的顺序问题。
Peoplemayspendtimeinmakingdecisionsabout______.People’sdecisionofthemethodofstudyingforatestoriginatesfrom
TheentrancerateofmedicalschoolsoftheUSin2001was______.
Thestudentcannotregisterbecause______.
Dollywasonceanawfullylonelysheep.Whenthefamouscloned(ofanexactcopyofaplantoranimalmadebytakingacellfrom
ImmediatelyaftertheCivilWar,however,thedietbegantochange.【B1】Railtransportationincreasedthesupplyandimprovedt
Whathascloningbypassed?
随机试题
子宫脱垂最主要的病因是
对流行性腮腺炎的护理,以下正确的是
对个人买卖有价证券(含国债,但不含股票)的所得要按( )缴纳个人所得税。
甲在一刑事附带民事诉讼中,被法院依法判处罚金并赔偿被害人损失,但甲的财产不足以全部支付罚金和承担民事赔偿。下列关于如何执行本案判决的表述哪一项是正确的?()
以城市、医院、工业区垃圾、有害污泥等为有机原料制成的有机肥垃圾肥可以在农作物上大量的使用,效果甚好。()
计算(x+y)2dxdy,,其中D:|x|+|y|≤1.
中断是CPU与外部设备数据交换的重要方式。CPU响应中断时必须具备三个条件,分别为:外部提出中断请求;本中断未屏蔽;(4)。CPU响应中断后,必须由(5)提供地址信息,引导程序进入中断服务子程序:中断服务程序的入口地址存放在(6)中。
设x="123",y=123,k="y",表达式x+&k的值是
有以下程序: #include<stdio.h> main() {intb[3][3]={0,1,2,0,1,2,0,1,2},i,j,t=1; for(i=0;i<3;i++) for(j=i;j<=i;j++)t+
Whatadvantagedoesthespeakermentionforeachofthefollowingphysicalactivities?ChooseSIXanswersfromtheboxandwrite
最新回复
(
0
)