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
35
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 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thenuclear transfer。
转载请注明原文地址:https://jikaoti.com/ti/DbfsFFFM
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
Almostallourmajorproblemsinvolvehumanbehavior,andtheycannotbesolvedbyphysicalandbiologicaltechnologyalone.Wha
CollegesportsintheUnitedStatesareahugedeal.AlmostallmajorAmericanuniversitieshavefootball,baseball,basketball
lawyer文章开门见山提到他是个律师,如果漏听,后面还提到他从什么学校毕业,干什么工作,这些都能帮助找出正确答案。
Whatkindofproofdidthemanprobablyhavewhenheboughttheradio?
Nottoomanydecadesagoitseemed"obvious"bothtothegeneralpublicandtosociologiststhatmodemsocietyhaschangedpeopl
Everyoneknowsthattaxationisnecessaryinamodernstate:【21】______it,itwouldnotbepossibletopaythesoldiersand
Everyoneknowsthattaxationisnecessaryinamodernstate:【21】______it,itwouldnotbepossibletopaythesoldiersand
InNewZealandChristmasDayitselfisobservedmuchthesamewayasitisintheUnitedStatesandEurope.(61)Therearesome
Evenplantscanrunafever,especiallywhentheyareunderattackbyinsectsordiseases.But21humans,plantscanhavetheir
随机试题
Mr.Leonard,theprincipaloftheBedfordAcademyHighSchoolinBedford-Stuyvesant,Brooklyn,isamanofmanysolutions,many
糖尿病时甲苯磺丁脲的治疗作用机制主要是
严重烧伤时,导致血管通透性增加的主要机制是
A、喜B、悲C、惊D、思E、怒导致气缓的病邪是()
下列债券结算方式中,比较适合交易非常频繁和活跃的市场,尤其是在交易所撮合交易模式和做市商机制比较发达的场外市场的是()。
一个测验能测出它所要测量的属性或特点的程度,指的是该测验的()
某小学学生绝大部分为独生子女,娇惯成性,组织纪律性差。某周三下午,在综合实践课教师王老师上课期间,学生朴某在课堂上大声说话,无理取闹,王老师对其进行制止时,朴某又与老师蛮缠,下课后王老师将朴某叫到自己所住宿舍内批评朴某(只有两人在场)。学生不服,与其争辩。
生物学研究发现,成群的蚂蚁中,大部分蚂蚁很勤劳,寻找、搬运食物争先恐后,少数蚂蚁却东张西望不干活。当食物来源断绝或蚁窝被破坏时,那些勤快的蚂蚁一筹莫展。“懒蚂蚁”则“挺身而出”,带领众伙伴向它早已侦察到的新的食物源转移。这就是所谓的懒蚂蚁效应。根据上述定
已知抛物叶形线的一部分.如图3—4所示,它围成的图形为M,则M的面积A=_________,M的质心(形心)(x,y)=________.
下列选项中,不属于控件的是()。
最新回复
(
0
)