问题 单项选择题

试管婴儿、试管苗、克隆羊三者均属于生物工程技术的杰出成果,下面对其生物学原理及技术的叙述正确的是()

A.都属于无性生殖,能保持母本性状

B.都应用了细胞工程的技术

C.都充分体现了体细胞的全能性

D.都不会发生基因重组和变异

答案

参考答案:B

解析:

试管婴儿是采用体外受精、动物细胞培养和胚胎移植等技术形成的,属于有性生殖,该过程没有发生基因重组,但可能发生变异,也不能体现细胞的全能性;试管苗是采用植物组织培养技术形成的,属于无性生殖,能保持母本性状,充分体现了体细胞的全能性,该过程没有发生基因重组,但可能发生变异;克隆羊是采用核移植、胚胎移植等技术形成的,属于无性生殖,体现了动物体细胞核的全能性,该过程没有发生基因重组,但可能发生变异;这三者都应用了细胞工程技术。故选B

考点:本题考查试管婴儿、试管苗和克隆羊的相关知识。

单项选择题
单项选择题

Abortion. The word alone causes civil conversation to flee the room. This is largely because the pro-choice and pro-life positions are being defined by their extremes, by those who scream accusations instead of arguments.

More reasonable voices and concerns, on both sides of the fence, are given little attention.

For example, pro-life extremists seem unwilling to draw distinctions between some abortions and others, such as those resulting from rape with an underage child. They would make no exception in the recent real-life case of a woman who discovered in her fifth month that her baby would be born dead due to severe disabilities.

On the other hand, pro-choice extremists within feminism insist on holding inconsistent positions. The pregnant woman has an unquestionable fight to abort, they claim. Yet if the biological father has no say whatsoever over the woman’s choice, is it reasonable to impose legal obligations upon him for child support Can absolute legal obligation adhere without some sort of corresponding legal rights

The only hope for progress in the abortion dialogue lies in the great excluded middle, in the voices of average people who see something wrong with a young girl forced to bear the baby of a rapist.

Any commentary on abortion should include a statement of the writer’s position. I represent what seems to be a growing "middle ground" in pro-choice opinion. Legally, I believe in the right of every human being to medically control everything under his or her own skin. Many things people have a legal right to do, however, seem clearly wrong to me. adultery, lying to friends, walking past someone who is bleeding on the street. Some forms of abortion fall into that category. Morally speaking, my doubts have become so extreme that I could not undergo the procedure past the first three months and I would attempt to dissuade friends from doing so.

Fanatics on both sides are using reprehensible and deceitful tactics. An honest dialogue on abortion must start by re-setting the stage, by denouncing the approaches that block communication.

According to the passage, the pro-life and pro-choice positions on abortion are ().

A. complementary to each other

B. opposed to each other

C. similar in nature

D. reconcilable in a way