Biology 3 GCSE (Micro-organisms) Notes about Yeast and respiration. 2.0 / 5 based on 1 rating ? BiologyMicrobes and diseaseGCSEAll boards Created by: Edi AkpanCreated on: 25-03-12 14:25 Respiration Anaerobic (Fermentation) Glucose --> Ethanol + Carbon Dioxide + Energy Used to make Beer Aerobic Glucose + Oxygen --> Carbon Dioxide + Water + Energy Used to make bread 1 of 3 Breadmaking Yeast converts sugars to carbon dioxide and some ethanol. The carbon dioxide is what makes the bread rise. As the carbon dioxide expands, it gets trapped in the dough, making it lighter. The dough is kneaded, trapping air which provides a source of oxygen for Aerobic respiration. 2 of 3 Conditions For Bread Making Temperature - Enzymes like to work in warm conditions (about 35°C) Glucose - needed for respiration Aerobic Conditions - Maximises CO2 produced pH - Doesn't really matter 3 of 3
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