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
25
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
Whendidthepersonsufferfromthecomputerrelateddisease?
HowmuchofFinland’ssurfaceiscoveredwiththickforests?
StandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtinschoolsandtonon-nat
Almostallourmajorproblemsinvolvehumanbehavior,andtheycannotbesolvedbyphysicalandbiologicaltechnologyalone.Wha
WhatdoyouknowaboutGeorgeDaniels?
Mr.Smith,apassengeronthetranscontinentaltrain,appearedbeforethejudge.Apoliceofficerclaimedhehadattemptedto【
(61)Environmentalistsandactivistsaccusedtheworld’srichnationsofmanagingaglobalconferenceongeneticallymodifiedfoo
Whathascloningbypassed?
Theaimof"Noah’sArk"projectisto______.HowlongwilltheChinesepandacloningprojecttakeaccordingtothepassage?
HongKong’sonceboomingmovieindustry--oneoftheworld’sbiggest——facesextinctionasvideopiracy(盗版)becomesmoreandmorep
随机试题
下列关于肝性脑病发病机制的叙述,错误的是
羌活、独活都具有的功效是
下列叙述正确的是
下列哪一项是老年人运动应遵循的原则
某医师善治脾胃不和所致的胸膈痞闷,常用中成药木香顺气丸(水丸),该药的药物组成为木香、醋香附、甘草、厚朴、苍术(炒)、砂仁、槟榔、陈皮、枳壳(炒)、青皮(炒)、生姜等。功能为行气化湿、健脾和胃,用于治疗湿浊中阻、脾胃不和所致的胸膈痞闷、脘腹胀痛、呕吐恶心、
慢性肾炎病人,近两日尿少,昼夜仅300~400ml,血压180/110mmHg,血钾6.4mmol/L,该病人可进食下列哪种饮食
对我国教师权利和义务做出明确、具体规定的是()。
世界食品需求能否保持平衡,取决于人口和经济增长的速度。人口增长会导致食物摄取量的增加;另一方面,经济增长会促使畜产品消费增加,改变人们的食物结构,从而对全球的谷物需求产生影响。 据此可知( )。
经济全球化是生产力发展的要求,是第二次世界大战后新技术革命推动的结果,是不以人的意志为转移的客观趋势。世界经济全球化的表现不包括
Asimplecomputerprogramthatteacheschildrentodistinguishbetweensoundscandramatically(1)______theirlisteningskills.
最新回复
(
0
)