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
60
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、It makes a clone from an ordinary, adult cell.
B、It makes the first normal and healthy cloned animal.
C、It paves the way to the cloning of human beings.
D、It makes a cloned animal with only mother.
答案
A
解析
此题考查多利羊出世在技术上有何突破,关键词是breakthrough,否则很可能想当然地选择其他选项。
转载请注明原文地址:https://kaotiyun.com/show/CnRd777K
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
Forthispart,youshouldwriteacompositiononthetopic"DevelopmentofAgriculture"ac-cording,tothegivenoutline:1)
【61】Notlongago,weAmericanshadaprettygoodideaofwhatfamilymeant.Buttoday,withpeoplelivingtogetherinsomanyd
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoolstocopewithworkthatisdangerous,boring,burd
Properarrangementofclassroomspaceisimportanttoencouraginginteraction.Mostofushavenoticedhowimportantphysica
Whatkindofproofdidthemanprobablyhavewhenheboughttheradio?
Whatisthemajorwayforalawyertolearnlaw?
Whatkindofproofdidthemanprobablyhavewhenheboughttheradio?
Whathascloningbypassed?
InNewZealandChristmasDayitselfisobservedmuchthesamewayasitisintheUnitedStatesandEurope.(61)Therearesome
Whathascloningbypassed?
随机试题
假设有A、B、C、D、E五种品牌,铁杆品牌忠诚者的购买类型应为()
有人认为,只有写到书本上的理论才是真实可靠的,不顾实际情况,死搬书本上的教条,这在认识论上犯了
下列关于慢性肾盂肾炎的描述中,哪项是正确的?
下列有关基金份额持有人大会的说法正确的有:()
在各种开挖方法中,初期支护拆除量大的方法是()。
某项永久性奖学金,每季度计划颁发1万元奖金。若年实际利率为8.24%,该奖学金的本金应为()元。
青年:画家
根据《国家赔偿法》的规定,国家赔偿的主要方式是()。
习近平指出:60年前,我们人民共和国的缔造者们,同经过普选产生的1200多名全国人大代表一道,召开了第一届全国人民代表大会第一次会议,通过了《中华人民共和国宪法》,从此建立起中华人民共和国的根本政治制度——人民代表大会制度。中国这样一个有5000多年文
追星是青少年从孩子向成人成长过程中生理、心理过程的一种反映,是一种客观、正常的社会现象。青少年正处于由孩子向成人成长的发展阶段,明星的出现使他们眼前一亮。他们从明星的身上看到了自我实现的希望,所以追随他们、崇拜他们,把他们作为自己的榜样。
最新回复
(
0
)