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Microbes Microbes M BACTERIA VIRUS FUNGI R S G R Remember a living organism must be able to demonstrate that it can perform ALL the 7 life processes E N Microbes BACTERIA VIRUS FUNGI Movement Respriation Sensitivity Growth Reproduction Remember a living organism must be able to demonstrate that it can perform ALL the 7 life processes Excretion Nutrition Microbes and Disease There are three main types of microbes VIRUS BACTERIA FUNGI Microbes and Disease There are three main types of microbes VIRUS- common cold, measles, polio BACTERIA- Tuberculosis FUNGI- Athlete’s foot Bacteria multiply very rapidly. Two can very quickly, become four then eight and so on. When bacteria enter our bodies they may produce toxins. These poisonous toxins can make us feel unwell. Not all Bacteria are pathogens Bacteria Virus The virus attaches itself to the cell membrane of the host cells. Ciliated cells found in the air passages It the injects its genetic material (DNA) into the host cell. It the injects its genetic material (DNA) into the host cell. The DNA material then makes copies of itself by using the cell’s enzymes and raw materials. Each DNA then makes its own protein coat around itself forming a new virus. The cell then swells with all these new viruses and it bursts letting all the viruses free to invade new cells. The cells that have been damaged gives rise to the symptoms that we experience with the disease. All viruses are pathogens and can affect animals and plants Fighting disease Fighting disease Disease Disease • Pathogen: an organism that causes a 1………… disease. . • Pathogenic microbes make poisons called 2…………… toxins. • Toxins cause the 3…………. symptoms of Salmonella food poisoning. Toxins are a bit like poisons • Most pathogenic microbes can be caught by other people: they are 4………………. . infectious. • Reminder: some types of 5…… white blood cell make antitoxins. disease infectious white symptoms