第二单元第四章没有细胞结构的微小生物（The second unit, the fourth chapter, has no cell structure of tiny creatures）.docVIP

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第二单元第四章没有细胞结构的微小生物（The second unit, the fourth chapter, has no cell structure of tiny creatures）.doc

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第二单元第四章没有细胞结构的微小生物（The second unit, the fourth chapter, has no cell structure of tiny creatures）

第二单元第四章没有细胞结构的微小生物（The second unit, the fourth chapter, has no cell structure of tiny creatures） The second unit, the fourth chapter, has no cell structure of tiny organisms - viruses Knowledge and skills The beginning of the 1.20 century, scientists first observed by ____ tobacco mosaic virus is a rod-shaped particles. 2. viruses cannot live independently and must live in other organisms. According to their different parasitic cells, the virus can be divided into three categories: ____ virus, ____ virus, ____ virus. The simple structure of the 3. virus, consisting of ____ shell and internal ____, no ____ structure. Reference answer: 1. electron microscope 2. animals, plants, bacteria 3. protein, genetic material, cell Process and method Collect and sort out information about diseases caused by viruses from the Internet, and train students to acquire information and handle information. Emotion, attitude and values Paying attention to the relationship between viruses and other organisms in the biosphere, especially the relationship with human beings, helps students to establish a healthy attitude towards life and things, and is a dialectical view of two divides into two. Cooperate with you to explore 1. how small is the virus? The virus is equivalent to basketball and a skyscraper for the cell. Its only in the electron microscope that you see the amount of juice in the nanoparticles. 2. what is a virus like? A virus free cell structure consisting of a protein coat and an internal genetic material. Viruses cannot live independently and must be parasitic in the cells of other organisms in order to represent life. The virus is proliferating in the host cell. 3. why eat candy can prevent poliomyelitis? Candy is a kind of oral vaccine, this vaccine is attenuated viruses after artificial processing, can prevent polio (also called polio). Example 1: the life activities of viruses in host cells are mainly expressed in () A. feeding, digestion and absorption B. swimming and g