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第三章 细胞的基本结构 PowerPoint PPT Presentation


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第三章 细胞的基本结构. 第一节 细胞膜 —— 系统的边界. 问题探讨. 光学显微镜下能看见细胞膜吗?. 光镜下未经染色的动物细胞. 怎样区分显微镜视野中的气泡和细胞?. 气泡有一圈很粗的黑边,里面只有空气,是光亮的;而细胞是一个具有细胞膜、细胞核和细胞质的复杂结构,而且是立体的。在显微镜下,通过调节焦距可以观察到细胞的不同层面。. 科学家用显微注射器将一种染料 —— 伊红注入变形虫体内 , 伊红很快扩散到整个细胞 , 却不能逸出细胞。. 伊红为什么不会逸出细胞?此实验说明了什么?. 细胞作为一个完整的系统,它有边界。. 人的口腔上皮细胞.

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第三章 细胞的基本结构

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