问题 实验题

下图是某植物细胞,请据图作答:(10分)

(1)图中⑤是             ,⑥是                

(2)图中②是       ,其主要作用是                 

(3)对生物的传种接代起重要作用的遗传物质存在于【 】         内。

(4)在细胞分裂中,变化最明显的是【 】___   ,细胞分裂前后遗传物质的变化是_________(填变多或不变)

(5)与人的口腔上皮细胞相比,主要不同是【 】       【 】       和细胞壁。

(6)细菌与该细胞相比主要的区别是                   

答案

(1)液泡  细胞质 

(2)细胞膜  控制物质的进出

(3)4细胞核    (4)4细胞核  不变

(5)3叶绿体  5液泡  (6)无成形的细胞核

题目分析:(1)图示中①是细胞壁,②是细胞膜,③是叶绿体,④是细胞核,⑤是液泡,⑥是细胞质;

(2)细胞膜紧贴在细胞壁的内面,能控制物质进出,保持细胞内部环境的相对稳定;

(3)细胞核一般位于细胞的中央,里面有遗传物质,能够传递遗传信息,对细胞的生命活动起控制作用;

(4)在细胞分裂过程中,染色体复制加倍,随着分裂的进行,染色体分成形态和数目相同的两份,分别进入两个新细胞中.这样就保证了通过细胞分裂产生的新细胞与原细胞所含的遗传物质相同;

(5)动物细胞和植物细胞相比,它们都有细胞膜、细胞核、细胞质、线粒体,但是动物细胞没有细胞壁、叶绿体和液泡,而植物细胞有细胞壁、叶绿体和液泡.因此植物细胞与动物细胞区别在于植物细胞有:细胞壁、叶绿体和液泡;

(6)细菌的基本结构有细胞壁、细胞膜、细胞质和DNA集中的区域,没有成形的细胞核.没有叶绿体,因此营养方式是异养,必须依靠现成的有机物维持生活,在生态系统中扮演分解者.而动植物细胞的基本结构是细胞膜、细胞质和细胞核.植物细胞有叶绿体,在生态系统中扮演生产者;动物细胞没有叶绿体,扮演消费者.因此细菌与动植物细胞的主要区别是细胞内没有成形的细胞核.

判断题
单项选择题

In order to understand, however imperfectly, what is meant by "face", we must take (1) of the fact that, as a race, the Chinese have a ply (2) instinct. The theatre may almost be said to be the only national amusement, and the Chinese have for theatricals a (3) like that of the Englishman (4) athletics, or the Spaniard for bull-fights. Upon very slight provocation, any Chinese regards himself in the (5) of an actor in a drama. He throws himself into theatrical attitudes, performs the salaam, falls upon his knees, prostrates himself and strikes his head upon the earth, (6) circumstances which to an Occidental seem to make such actions superfluous, (7) to say ridiculous. A Chinese thinks in theatrical terms. When roused in self-defense he addresses two or three persons as if they were a multitude. He exclaims: "I say this in the presence of You, and You, and You, who are all here present. " If his troubles are adjusted he (8) of himself as having "got off the stage" with credit, and if they are not adjusted he finds no way to "retire from the stage". All this, (9) it clearly understood, has nothing to do with realities. The question is never of facts, but always of (10) . If a fine speech has been (11) at the proper time and in the proper way, the requirement of the play is met. We are not to go behind the scenes, for that would (12) all the plays in the world. Properly to execute acts like these in all the complex relations of life, is to have "face". To fail them, to ignore them, to be thwarted in the performance of them, this is to " (13) face". Once rightly apprehended, "face" will be found to be in itself a (14) to the combination lock of many of the most important characteristics of the Chinese.

It should be added that the principles which regulate "face" and its attainment are often wholly (15) the intellectual apprehension of the Occidental, who is constantly forgetting the theatrical element, and wandering (16) into the irrelevant regions of fact. To him it often seems that Chinese "face" is not unlike the South Sea Island taboo, a force of undeniable potency, but capricious, and not reducible to rule, deserving only to be abolished and replaced by common sense. At this point Chinese and Occidentals must agree to (17) , for they can never be brought to view the same things in the same light. In the adjustment of the incessant quarrels which distract every hamlet, it is necessary for the "peace-talkers" to take a careful account of the (18) of "face" as European statesmen once did of the balance of power. The object in such cases is not the execution of even-handed justice, which, even if theoretically desirable, seldom (19) to an Oriental as a possibility, but such an arrangement as will distribute to all concerned "face" in due proportions. The same principle often applies in the settlement of lawsuits, a very large percentage of which end in what may be called a (20) game.

(17)()

A.disagree

B.compromise

C.settle

D.surrender