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知识清单:细胞膜的结构和功能

  • 2026-11-03 16:09:57
知识清单:细胞膜的结构和功能

【知识清单】第3章 细胞的基本结构

第1节 细胞膜的结构和功能

【背】1.(教材P40~41)细胞膜的功能

(1)将__________________,使细胞成为________的系统,保障细胞________的相对稳定。

(2)控制__________________。控制具有______________________。

(3)进行细胞间____________________________________,具体有:①通过_____________________传递交流,常见的信息分子有____________;②通过_________________交流,如____________③通过________________交流,如________________________________________。

【背】2.(教材P43)细胞膜的成分

各种生物膜主要由________、________组成,细胞膜外侧还含有少量起识别等功能的__________。

膜的功能主要取决于膜上________________。功能越__________的细胞膜,蛋白质的____________越多。

3.(教材P42)对生物膜成分的探索历程

(1)1895年,欧文顿发现溶于脂质的物质,比不能溶于脂质的物质更容易通过细胞膜进入细胞的现象,推测出:__________________。

(2)化学分析发现:组成细胞膜的脂质有__________,其中________含量最多。磷脂一端为________端,两个脂肪酸一端为________端。

(3)1925年,两位荷兰科学家根据红细胞膜的单分子层的面积恰为红细胞表面积的________,推断出细胞膜中的磷脂分子必然排列为______________。

制备细胞膜最好材料是:_________,因为__________________________。

(4)1935年,英国学者研究细胞膜的张力时发现细胞的张力明显_______油—水界面的表面张力,结合其他已知理论,推测细胞膜可能还附有________。

4.(教材P43)对生物膜结构的探索历程

(1)静态模型:1959年,根据在电镜下看到的细胞膜清晰的________的三层结构,提出假说:所有的生物膜都由____________________三层结构构成,电镜下看到的中间的亮层是______分子,两边的暗层是____________分子。生物膜是____________结构。但这种静态模型不能解释____________等现象。

(2)1970年,科学家分别用发绿色荧光、红色荧光的染料标记小鼠、人细胞表面的蛋白质分子,通过人—鼠细胞融合实验,以及其他实验证据表明____________________________。

(3)在新的观察和实验证据的基础上,又有学者提出了一些关于生物膜的分子结构模型,其中______________为大多数人所接受。

5.(教材P44~45)生物膜的流动镶嵌模型

(1)提出者:辛格和尼克尔森。

【背】(2)内容:①________________是膜的基本支架,其内部是磷脂分子的_______端,水溶性分子或离子不能自由通过,具有_______用;②________________镶嵌在磷脂双分子层中,有的在表面、有的部分或全部_______、有的_______,在物质运输等方面有重要作用;③细胞膜具有_____________(结构特点),表现在:磷脂分子可以_______________,大多数蛋白质也能__________。

(2)细胞膜特性

结构特性:___________举例:(_________________________________)

具有流动性的原因:构成膜的磷______________________都是可以运动的。

功能特性:___________,结构基础:_________________________________

【背】6.(教材P45)细胞膜外表面的糖类与蛋白质分子结合形成________,与脂质结合形成________。这些糖类分子叫作________,与细胞表面________、__________________等有关。

7.植物细胞的细胞壁

(1)成分:主要是______________和______________

(2)形成:与______________有关

(3)去除方法:酶解法(_______酶和______________酶)

(4)功能:______________作用

(5)特性:______________性


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0.086654s