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Yeast is an organism that ferments. When yeast ferments sugar, the yeast eats sugar and produces alcohol. Other cells make vinegar or lactic acid when they ferment sugar. This is used to make beer, some types of fuel and to make bread rise.
Types of fermentation
- Ethanol fermentation always produces ethanol and carbon dioxide. It is important in bread-making, brewing, and wine-making.
- Lactic acid fermentation produces lactic acid. It happens in muscles of animals when they need lots of energy fast.