Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom.
Yeast is a very useful microorganism and is used to cause fermentation. Yeast grows by fermentation, feeding upon sugars. During fermentation, yeast converts glucose into ethanol and carbon dioxide and is therefore used in beer and wine manufacturing, and baking. In beer and wine manufacturing, ethanol is the desired product and carbon dioxide is useful in baking.
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