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How does yeast leaven bread?

When the yeast cells feast on the sugar (or the starch that a yeast enzyme has converted into glucose, a simple sugar), a chemical reaction takes place. The sugar ferments and most of it converts into alcohol and carbon dioxide. As with baked goods made with baking powder, the carbon dioxide - along with trapped expanding air and steam - leavens the bread.

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00:22:00 on 11/04/07 by Webmaster - Questions and Answers -