(2)The egg nucleus(细胞核) was removed.
(3)A cell was taken from the udder(乳房) of a pregnant(怀孕的) sheep.It was “starved”,so that it stopped growing.
(4)The two cells were combined into one and then implanted in a third sheep,where it grew normally.
(5)The clone was born.It was genetically identical to the pregnant sheep in step (3).
This sounds much easier than it actually was.To end up with one clone,the scientists started with 277 udder cells.And they needed in a way to make the egg cell accept a new nucleus.They did that by starving the cell in step (3).
It may soon be possible to clone many types of animals.Will we also be able to clone human organs,or even whole human beings?We have only begun to think about the morality of cloning technology.Maybe the question to ask is not whether we can clone humans,but instead,should we clone humans?
4.Dolly is a sheep
because she is grown from a cell of an adult female sheep.
A.that has not her father
B.that has not her mother
C.that has no parents
D.that has not any tail
答案 C
解析 推理判断题。从文中可以看出,多莉是从一只成年羊的细胞中克隆出来的,所以它没有父母,而是那只羊的一个翻版。
【(豫皖京闽粤通用)2017届高考英语北师大版一轮复习配套练习:book5 Unit 13《people》(含解析)】相关文章:
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习完形填空专题训练:技法1 利用上下文暗示解题(含解析)
★ 【北师大版】2014届高考英语一轮复习指导课时作业:Unit 1 B卷 Word版含解析
★ 【浙江专用】2014届高考英语一轮复习课时作业(三十八)选修8Unit 3《Inventors and inventions》
★ 2014届高考英语一轮复习课时作业(三十四)选修6Module 4《Music》(外研版)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:24(含解析)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (14)
★ 【北京专用】2014届高考英语一轮复习方案课时作业:必修4 Unit 5 Theme parks
★ 【三维设计】2017版(江苏专用)二轮复习练习:选修8 Unit 3《The world of colours and light》课时跟踪检测A卷(含解析)
★ 2014年牛津译林版高中英语总复习(第1轮)同步练习 M3《Unit 3 Back to the past》Word版含解析
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第10组(含解析)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21