苏教版初中生物八年级下册必记知识点（ junior high school grade eight biological knowledge points to remember）.docVIP

4苏教版初中生物八年级下册必记知识点（4 junior high school grade eight biological knowledge points to remember） Grade eight will remember the knowledge points The class __________ group name ______ ____________ Eighth unit Biotechnology The twentieth chapter: Biotechnology in daily life 1. Fermentation is caused by microorganisms. Fermentation technology refers to the use of microbial fermentation, large-scale production of fermentation products technology. 2, wine (wine), bread, Steamed Buns is a product of yeast fermentation; fruit wine is placed for a long time will have the result of yeast fermentation; wine is exposed in the air is acid acetic acid fermentation results; the milk into yogurt, sour pickled cabbage vegetables into bacteria lactic acid bacteria. 3, when the wine brewed, adding yeast containing yeast; wash steamed glutinous rice with cold boiling water, in order to prevent the high temperature inhibits the growth and reproduction of yeasts. Suitable temperature of 25~30 DEG C for brewing fermented glutinous rice. 4, under aerobic conditions, the yeast can be aerobic decomposition of glucose to produce carbon dioxide and water, Steamed Buns spongy yeast flour sugar in the decomposition of carbon dioxide produced by thermal expansion results; under anaerobic conditions, anaerobic respiration yeast can decompose sugars and produce alcohol and carbon dioxide, this principle is to brew fermented glutinous rice. 5, the traditional fermentation technology can only use the original microorganisms in nature to ferment, the traditional fermented products are soy sauce, vinegar, Sufu and so on. Modern fermentation technology has entered into a new stage of fermentation products for human beings according to the wishes of human beings to produce special microorganisms, and modern fermentation products include antibiotics, vitamins and so on. 6. Food spoilage is caused by the growth and reproduction of microorganisms. The basic principle of food preservation: using certain methods