Yeast

Single-celled micro-organism that converts its food (sugar or starch) into alcohol and carbon dioxide through fermentation.

Yeast are used for making beer, wine, cheese and some breads. When making bread, the carbon dioxide produced by yeast makes the dough rise.

Yeast needs sugar or starch and a warm environment in order to grow.

Source: GreenFacts, based on WGBY Glossary 

Fermentation

Español: Levadura
Français: Levure

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