问题 填空题

阅读下列材料,回答问题:

材料一:俄罗斯科学院理论与实验生物物理研究所的科研人员,在分析了老鼠单细胞胚胎细胞核移植前后钾离子浓度的变化后发现,针对卵细胞进行的任何外在行为,必将破坏它的生物化学平衡,导致胚胎细胞正常发育进程的改变。因此,专家指出,这一实验成果有助于解释大量克隆动物出现不正常的原因。细胞核移植是现代生物技术中常见的现象:克隆、细胞核与细胞质相互作用、人工授精等,都要对卵细胞施加外在的作用。这种外在行为是否影响未来胚胎细胞的发育与成长?

材料二:在当代,医生几乎都能在所有人类器官和组织上实行移植手术。但就科学技术而言,器官移植中的排斥反应仍是最为头疼的事,如果把“克隆人”的器官提供给“原版人”作器官移植之用,则绝对没有排斥反应之虑,因为二者基因相配,组织也相配。问题是,利用“克隆人”作为器官供体合不合乎人道?是否合法?经济是否合算?克隆技术还可以用来大量繁殖有价值的基因,例如,在医学方面,人们正是通过“克隆”技术生产出治疗糖尿病的胰岛素,使侏儒症患者重新长高的生长激素和抗多种病毒感染的干扰素等。

(1)根据材料一,可得出大量克隆动物出现不正常的原因可能是______。

(2)尽管克隆动物在实际生活中还没有实际用途,但克隆技术在医学上却有巨大潜力,表现在_______。

(3)克隆技术作为现代生物技术和试管婴儿技术相比较,前者属于_______生殖,后者属于______生殖。

(4)器官移植中排斥反应仍是最为头痛的事,原因是_______。

(5)除了通过克隆技术生产人的胰岛素、生长激素和能抗多种病毒感染的干扰素外,还可以采用_______方法生产。

(6)英国罗斯林研究所的一项研究显示,利用克隆技术根本无法培育出完全相同的个体,究其原因,除了发育过程中的环境因素的影响外,还可能有________等原因(至少写出两个)。

答案

(1)对卵细胞进行的外在行为,破坏了它的生物化学平衡,导致胚胎细胞正常发育进程改变

(2)生产胰岛素、生长激素、干扰素

(3)无性      有性

(4)免疫系统的识别和清除

(5)基因工程或发酵工程

(6)细胞分裂中可能发生基因突变、受卵细胞细胞质中遗传物质的影响

单项选择题
阅读理解

阅读理解。

     A newspaper in Helsinki, Finland, recently published a cartoon of a baby with a mobile phone, telling

his parents that his diaper (尿布) needed changing. But it's hardly a joke. Helsinki is home to Nokia, the

mobile-phone maker. It's one of the most "mobile" cities in the world: About 92 percent of its households

have at least one mobile phone. And the kids start young.

     "A relatively normal age to get a mobile phone is now 7," says Jan Virkki, marketing manager for a

mobile-phone company. Among the second graders at the Kulosaari Elementary School, the most popular

object of desire this year is not a Barbie or a Gameboy. It is a Nokia mobile phone with a picture of their

own choice on the screen.

      "One of the first things we discuss when school starts is the rules for mobile phones," says Tiia Korppi,

a teacher. Among the rules: You have to put it away out of sight. You cannot turn it on. You cannot send

text messages to your friends, or play amusing tunes (令人发笑的曲调) in class, or call your parents or

call for a pizza during history.

1. The author uses the newspaper cartoon to show that _____.

A. he is good at telling jokes

B. he cares much for children

C. mobile phones are toys for new-born babies

D. mobile phones are widely used in Finland

2. The passage is mainly about _____.

A. different uses of mobile phones

B. a successful mobile-phone maker

C. effects of mobile phones on children

D. school rules for the use of mobile phones