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Baking
- Mix yeast with flour, sugar and H2O to make dough.
- Kept dough warm: Yeast respires sugar to produce CO2. This make dough rise.
- When the bread is baked, the yeast is killed.
Brewing
- Yeast respires sugar (from juice, grain) to form ethanol and CO2.
- The ethanol makes the drink alcoholic, carbon dioxide gives the drink its fizz.
- The process is called fermentation.
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