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
A、The nuclear transfer B、The process taking DNA C、The normal reproductive process D、The creation of cells C克隆是个热门话题,有关克隆的文章无非谈论
A、The nuclear transfer B、The process taking DNA C、The normal reproductive process D、The creation of cells C克隆是个热门话题,有关克隆的文章无非谈论
admin
2010-10-14
61
问题
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 Doily 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. Doily 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 scientist 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 in to 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 nuclear transfer
B、The process taking DNA
C、The normal reproductive process
D、The creation of cells
答案
C
解析
克隆是个热门话题,有关克隆的文章无非谈论两种,一是克隆技术,二是是否要克隆人类。把握这个主要方向,理解文章内容就比较容易了。此题问的是克隆超越了什么步骤,关键是读懂题目,如果不明白bypass只好抓住文章中的信息了。较大的干扰项是the nuclear transfer。
转载请注明原文地址:https://kaotiyun.com/show/qPy7777K
0
大学英语四级
相关试题推荐
Wefindthatbrightchildrenarerarelyheldbackbymixed-abilityteaching.Onthe【B1】______,boththeirknowledgeandexperien
A、HewaswatchingthedocumentaryonTV.B、Hewasattendingaparty.C、Hewaswatchingamovie.D、Hewasattendingameeting.D
A、Foratleasttwomoredays.B、Foratleastonemoreday.C、Fortwomoredays.D、Foronemoreday.B事实细节题。只要抓住关键句Rainisforeca
A、Shecanusehisgun.B、Shecanborrowsomeoneelse’sgun.C、Sheshouldhaveagunofherself.D、Shecan’tborrowhisgun.D男士所
YouAreWhatYouThinkDoyouseetheglassashalf-fullratherthanhalf-empty?Doyoukeepyoureyeuponthedough-nut(油
A、Theproblemmayhavebeenaverycomplicatedone.B、NoonecandoitC、Thewomanthinksthattheproblemistoocasy.D、Thema
Theinterestthatcreativedramaticsgeneratesinstudiesisitsmostobviousadvantage.Thefactthatchildrendevelop【C1】_____
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeveryoneonamassbasisortofindthegiftedfewan
By2010,halftherecoverablematerialinBritain’sdustbinswillberecycled--that,atleast,wasthetargetsetbyChrisPat
随机试题
女性,30岁。右前臂骨折石膏绷带固定。协助医师包扎时不正确的护理是()。
其他货币资金主要包括()。
下列属于经济法律关系客体的是( )。
下列关于监事会的说法中,正确的有()。
班主任马老师常对学生说:“先学做人,后学做事,社会需要的是身体健康、和谐发展的建设者和接班人,而不是只会死读书的‘呆子’。”这表明马老师具有()。
近10年来,移居清河界森林周边地区生活的居民越来越多。环保组织的调查统计表明,清河界森林中的百灵鸟的数量近十年来呈明显下降的趋势。但是恐怕不能把这归咎于森林周边地区居民的增多,因为森林的面积并没有因为周边居民人口的增多而减少。以下哪项如果为真,最能削弱题干
设向量组,α1=(a,2,10)T,α2=(一2,1,5)T,α2=(一1,1,4)T,β=(1,b,c)T.试问a,b,c满足什么条件时:(Ⅰ)β可由α1,α2,α3线性表出,且表示唯一?(Ⅱ)β不能由α1,α2,α3线性表出?
设α=(1,一1,a)T是的伴随矩阵A*的特征向量,其中r(AT)=3,则a=___________。
有以下程序:#include<stdio.h>voidfun(inta[],intn){ inti,t; for(i=0;i<n/2;i++){t=a[i];a[i]=a[n-1-i];a[n-1-i
Mary’seyesarered.She______crying.
最新回复
(
0
)