Bread dough rising, 1 of 2. Bread dough contains flour, yeast, water and some sugar and salt. When bread dough is mixed from ingredients and left undisturbed for several hours in a warm place, it rises (apparently increases in volume) noticeably. Flour in bread dough contains enzymes that break down starch into sugars. The yeast then feeds off the sugars, in the process producing carbon dioxide gas (CO2). Production and expansion of carbon dioxide causes the dough to rise. | |
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Crédit: | Science Photo Library / Turtle Rock Scientific |
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