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描写生物学科的句子汇编50条

关于高中生物知识点总结性语句

生物是正确了解身体,学习人和环境(植物,动物,自然界)之间关系的科目。对于生物的学习,最主要的就是知识点的积累,为此,小编准备了这篇高中生物知识点总结性语句,欢迎浏览!

1、生物体具有共同的物质基础和结构基础。

2、从结构上说,除病毒以外,生物体都是由细胞构成的。细胞是生物体的结构和功能的基本单位。

3、新陈代谢是活细胞中全部的序的化学变化总称,是生物体进行一切生命活动的基础。

4、生物体具应激性,因而能适应周围环境。

5、生物体都有生长、发育和生殖的现象。

6、生物遗传和变异的特征,使各物种既能基本上保持稳定,又能不断地进化。

7、生物体都能适应一定的环境,也能影响环境。

8、组成生物体的化学元素,在无机自然界都可以找到,没有一种化学元素是生物界所特有的,这个事实说明生物界和非生物界具统一性。

9、组成生物体的化学元素,在生物体内和在无机自然界中的含量相差很大,这个事实说明生物界与非生物界还具有差异性。

10、各种生物体的一切生命活动,绝对不能离开水。

11、糖类是构成生物体的重要成分,是细胞的主要能源物质,是生物体进行生命活动的主要能源物质。

12、脂类包括脂肪、类脂和固醇等,这些物质普遍存在于生物体内。

13、蛋白质是细胞中重要的有机化合物,一切生命活动都离不开蛋白质。

14、核酸是一切生物的遗传物质,对于生物体的遗传变异和蛋白质的生物合成有极重要作用。

15、组成生物体的任何一种化合物都不能够单独地完成某一种生命活动,而只有按照一定的方式有机地组织起来,才能表现出细胞和生物体的生命现象。细胞就是这些物质最基本的结构形式。

16、活细胞中的各种代谢活动,都与细胞膜的结构和功能有密切关系。细胞膜具一定的流动性这一结构特点,具选择透过性这一功能特性。

17、细胞壁对植物细胞有支持和保护作用。

18、细胞质基质是活细胞进行新陈代谢的主要场所,为新陈代谢的进行,提供所需要的物质和一定的环境条件。

19、线粒体是活细胞进行有氧呼吸的主要场所。

20、叶绿体是绿色植物叶肉细胞中进行光合作用的细胞器。

21、内质网与蛋白质、脂类和糖类的合成有关,也是蛋白质等的运输通道。

22、核糖体是细胞内合成为蛋白质的场所。

23、细胞中的高尔基体与细胞分泌物的形成有关,主要是对蛋白质进行加工和转运;植物细胞分裂时,高尔基体与细胞壁的形成有关。

24、染色质和染色体是细胞中同一种物质在不同时期的两种形态。

25、细胞核是遗传物质储存和复制的场所,是细胞遗传特性和细胞代谢活动的控制中心。

26、构成细胞的各部分结构并不是彼此孤立的,而是互相紧密联系、协调一致的,一个细胞是一个有机的统一整体,细胞只有保持完整性,才能够正常地完成各项生命活动。

27、细胞以分裂是方式进行增殖,细胞增殖是生物体生长、发育、繁殖和遗传的基础。

28、细胞有丝分裂的重要意义(特征),是将亲代细胞的染色体经过复制以后,精确地平均分配到两个子细胞中去,因而在生物的亲代和子代间保持了遗传性状的稳定性,对生物的遗传具重要意义。

29、细胞分化是一种持久性的变化,它发生在生物体的整个生命进程中,但在胚胎时期达到最大限度。

30、高度分化的植物细胞仍然具有发育成完整植株的能力,也就是保持着细胞全能性。

31、新陈代谢是生物最基本的特征,是生物与非生物的最本质的区别。

32、酶是活细胞产生的一类具有生物催化作用的有机物,其中绝大多数酶是蛋白质,少数酶是RNA。

33、酶的催化作用具有高效性和专一性;并且需要适宜的温度和pH值等条件。

34、ATP是新陈代谢所需能量的直接来源。

35、光合作用是指绿色植物通过叶绿体,利用光能,把二氧化碳和水转化成储存能量的有机物,并且释放出氧的过程。光合作用释放的氧全部来自水。

36、渗透作用的产生必须具备两个条件:一是具有一层半透膜,二是这层半透膜两侧的.溶液具有浓度差。

37、植物根的成熟区表皮细胞吸收矿质元素和渗透吸水是两个相对独立的过程。

38、糖类、脂类和蛋白质之间是可以转化的,并且是有条件的、互相制约着的。

39、高等多细胞动物的体细胞只有通过内环境,才能与外界环境进行物质交换。

40、正常机体在神经系统和体液的调节下,通过各个器官、系统的协调活动,共同维持内环境的相对稳定状态,叫稳态。稳态是机体进行正常生命活动的必要条件。

41、对生物体来说,呼吸作用的生理意义表现在两个方面:一是为生物体的生命活动提供能量,二是为体内其它化合物的合成提供原料。

42、向光性实验发现:感受光刺激的部位在胚芽鞘尖端,而向光弯曲的部位在尖端下面的一段。

43、生长素对植物生长的影响往往具有两重性。这与生长素的浓度高低和植物器官的种类等有关。一般来说,低浓度促进生长,高浓度抑制生长。

44、在没有受粉的番茄(黄瓜、辣椒等)雌蕊柱头上涂上一定浓度的生长素溶液可获得无子果实。

45、植物的生长发育过程,不是受单一激素的调节,而是由多种激素相互协调、共同调节的。

46、下丘脑是机体调节内分泌活动的枢纽。

47、相关激素间具有协同作用和拮抗作用。

48、神经系统调节动物体各种活动的基本方式是反射。反射活动的结构基础是反射弧。

49、神经元受到刺激后能够产生兴奋并传导兴奋;兴奋在神经元与神经元之间是通过突触来传递的,神经元之间兴奋的传递只能是单方向的。

50、在中枢神经系统中,调节人和高等动物生理活动的高级中枢是大脑皮层。

51、动物建立后天性行为的主要方式是条件反射。

52、判断和推理是动物后天性行为发展的最高级形式,是大脑皮层的功能活动,也是通过学习获得的。

53、动物行为中,激素调节与神经调节是相互协调作用的,但神经调节仍处于主导的地位。

54、动物行为是在神经系统、内分泌系统和运动器官共同协调下形成的。

55、有性生殖产生的后代具双亲的遗传特性,具有更大的生活能力和变异性,因此对生物的生存和进化具重要意义。

56、营养生殖能使后代保持亲本的性状。

57、减数分裂的结果是,新产生的生殖细胞中的染色体数目比原始的生殖细胞的减少了一半。

58、减数分裂过程中联会的同源染色体彼此分开,说明染色体具一定的独立性;同源的两个染色体移向哪一极是随机的,则不同对的染色体(非同源染色体)间可进行自由组合。

59、减数分裂过程中染色体数目的减半发生在减数第一次分裂中。

60、一个精原细胞经过减数分裂,形成四个精细胞,精细胞再经过复杂的变化形成精子。

61、一个卵原细胞经过减数分裂,只形成一个卵细胞。

初中英语句型分类知识点

1. 一般否定句

句型1[主语+特殊定式动词+not+行为动词或表语+其他]

1. China of today is not what it was thirty years ago.

2. "Isn't that Teddy Thomson out?"-"I think it's him, but I can't be a hundred percent sure."

3. "Oh, sir, he can't have said such a thing! He can't have spoken like that to you, sir!"

4. We must not wait for favors from Nature; we must take them from her.

5. I haven't finished the book yet. 6. Money could not buy happiness.

[注1] He is no fool. Great barkers are no biters.

[注2] 二十四个特殊定式动词:

句型2[主语+do(does, did)+ not+行为动词+其他]

1. Sorrow doesn't buy bread. 2. Pure gold does not dread fire.

3. "Why is Mr. Cooper so angry today?"-"I don't know why."

4. "They did not steal so much."-"I don't care how much." He said, "… A thief is a thief."

句型3[主语+ 行为动词+ no/not+宾语+其他]

1. A rolling stone gathers no moss.

2. Viola, hearing this, knew not how to behave, nor how to answer her.

3. I know not what course others may take, but, as for me, give me liberty or give me death!

4. We are fleet-winged men at arms; we fear not mountains high or rivers deep.

句型4[There be+ no/not/not any+主语(+状语)]

1. There was no well in the village at that time.

2. Oliver Twist was born in a workhouse… There were no aunts, no sisters, no cousins, no grand mothers.

3. There is not a moment to be lost. 4. There is no holding back the wheel of history

[附注] 一般否定句的其他表达方式:

1. Who knows it? (=No one knows it.) Dare he do it? (=He dare not do it.)

2. God only knows! (=No one knows.) As if I would allow it! (= I would certainly not allow it.)

3. Catch me doing that!

4. If I do I am a villain. (=I will not do.) Do that again if you dare.

5. In Heaven, an angel is nobody in particular. They shun personal fame and gains.

6. The city and the areas around it are an ice-free port and a nuclear weapon-free zone. The building is in a state of neglect.

7. She stood still, trying winly (in vain) to answer the battery of questions raised by the reporters.

8. I dislike the idea very much. Mr. White has refrained from making any official comment on the coup in that country. Yesterday she failed to get to school on time. The evidence is conclusive, excluding all possibilities of doubt. They excluded children (from) getting in. We'll forever live up to what the party expects of us. Avoid operating the keys roughly. She was refused admittance by them.

9. Slips are scarcely avoidable when you're new to your work. He is ignorant of conditions at the levels. Our PLA is worthy of being called a great army pf the people.

10. The meetings were marked by such an absence of lively discussions that at times they were almost on the point of breaking up. Lei Feng's noble deeds are above all praise. To do this is beyond my ability. He is out of the office. (= He is not in the office.) Tom is away from Cambridge. (= Tom is not at Cambridge.) It is far from perfect. That served to strengthen instead of weaken our determination (or: That strengthened, rather than weakened, our determination.) The truth is quite other than what you think. I know better than to quarrel.

2. 特指否定句

句型5[…not+非谓语成分…]

1. Not a soul was anywhere visible. 2. You must always remember not to become conceited.

3. The teacher told his pupils not to make such a mistake again.

4. I went to see him off, not to meet him. 5. We felt sorry for not coming on time

句型6[主语+否定式谓语+(宾语)+状语或从句(被否定部分)]

1. I don't think it is right to make such hasty decision. 2. I'm not feeling very well today.

3. I don't believe that he will come tomorrow.

4. You can't judge a thing only by its looks.

5. He's studying English now, but he doesn't speak English very well yet.

6. People did not shake off colonialist's yoke in order to put on hegemonist's yoke.

7. Don't think ill of me because I use her help. She gives it cheerfully as you see…

Lesson 3的经典语句及知识点

经典语句

Fair to middling. 还行,马马虎虎啦。middling是形容词,意为“中等的”。

情景展现

Bill和美国好友一起去美国剧院欣赏音乐演出,演出还不到一半,Bill就打起来哈欠,便说道“It’s so boring(太乏味了)”,好友微笑着说:Fair to middling.”。 Bill听了心里直犯嘀咕:“听音乐会,坐在中间就公平吗?”就问“Why are you talking about fairness?”,这次好友真的无语了。

想聊就聊

Shirley: How about this opera given by the famous musician?

雪莉:你认为这位著名的音乐家表演的.歌剧如何?

May: Fair to middling.Alittle hard to appreciate.

阿美:还好啦,知识有点难欣赏。

知识点津

在Fair to middling中,fair表示从good到poor的范围内的midway,不算太好也不算太差;而middling表示“中等的”。用于打招呼时表示“过得还行”,与just so-so意思相同。例如:

A: How are you? 过得怎么样?

B:Fair to middling. 还行,不算差。

初中英语句型的分类知识点

It引导的被动句

句型[It+被动式谓语+名词/形容词+实际主语(不定式、动名词)+其他]

1. It was considered a shame to cheat in examination. 2. It was found difficult for us to understand him.

3. It would be considered unwise your going there without a guide.

4. It was deemed sheer waste of time arguing about it. 5. It was proved wrong to say things like that.

句型[It+被动式谓语+实际主语(that/疑问关联词)+从句]

1. It is requested that you kindly take immediate action in the matter.

2. It was arranged that all the boys should go by bike and all the girls on foot.

3. It has not been found out who set the record.

4. It hasnt been made clear when the new road is open to traffic.

5. Has it been decided where we are to hold the conference?

保留宾语的.被动句

句型[主语+被动式谓语+保留宾语+(by+施动者)]

这类保留宾语的被动句中常用动词有:allow, afford, bring, deny, ensure, give, hand, lend, offer, owe, pass, pay, return, tell, show, teach等。

1.The Rosembergs were denied a fair and open trial.

2. Mr. Smith was given a prize.

3. The position was offered (to) Mr. Black.

4. He was shown the difference.

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