一、教材分析本节是人教版第四章第二节的内容,之前已经学习了细胞的基本结构,知道了细胞膜、细胞器膜、核膜在组成成分和结构上很相似,在结构和功能上紧密联系。并知道了生物膜都是选择性膜透过。为什么生物膜能控制物质的进出?这与生物膜的结构有什么关系?二、教学目标1.知识目标(1)通过分析科学家建立生物膜模型的过程,阐述科学发现的一般规律。(2)举例说明生物膜具有流动性特点。2.能力目标 First, the textbook analysis This section is the second chapter of Chapter PEP content, after learning the basic structure of the cell, know the cell membrane, organelle membrane, nuclear membrane composition and structure are very similar in structure and function Closely linked. And know that biofilms are selective membrane through. Why biofilm can control the material access? This biofilm structure and what is the relationship? Second, the teaching objectives 1. Knowledge goals (1) by analyzing the process of biofilm modeling scientists to elaborate on the general law of scientific discovery. (2) An example of a biofilm with fluidity characteristics. 2. Capacity goals