Eukaryotic microorganisms, having 1500 known species and classified in the Fungi kingdom are called Yeasts. Almost all yeast types are unicellular. However, a very few number of yeast types become multicellular by forming a chain of interconnecting budding cells. Yeasts are largely used in the manufacturing of alcoholic beverages such as beer and wine. Moreover, yeasts are also used in the backing process and also in the production of pure ethanol at the industrial level. Food spoilage occurs when yeasts grow in food products for a fairly long period of time.
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A fungus is one of the many members of a group of eukaryotic microorganisms. Yeasts, moulds and more familiar mushrooms also fall in the same group as fungi. Fungi have a large number of uses in daily life. They are used in manufacturing drugs and cultured foods as well. Fungi also have a medicinal use in folk medicines such as Traditional Chinese Medicine. Moreover, they are also used for pest control on a large scale. An important fact to be realised when using the mushroom form of fungi for edible purposes is that not all mushroom species are fit for eating since some of them are poisonous.
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