AP BIOLOGY

Detailed explanation-1: -Yeasts can undergo both aerobic and anaerobic repsiration. during anaerobic respiration, yeasts produce alcohol. Glucose is broken down into ethanol and carbon dioxide with the release of energy. Lactic acid is produced in muscles when they respire anaerobically.

Detailed explanation-2: -Anaerobic respiration in yeast The yeast has to switch to using anaerobic respiration to ensure it can survive. Ethanol and carbon dioxide are produced. Yeast can also be used to produce bread. Yeast respires using glucose in the sugar that was added to the dough.

Detailed explanation-3: -In the presence of oxygen, yeast undergo aerobic respiration and convert carbohydrates (sugar source) into carbon dioxide and water. In the absence of oxygen, yeasts undergo fermentation and convert carbohydrates into carbon dioxide and alcohol (Figure 2).

Detailed explanation-4: -Yeast is a microscopic organism that respires anaerobically. These respire in absence of oxygen and produce Ethyl alcohol and carbon dioxide.

Detailed explanation-5: -Yeast can respire both aerobically and anaerobically. It obtains more energy from aerobic respiration than anaerobic respiration. In absence of air, it continues to respire anaerobically. In bread-making, the yeast starts first with aerobic respiration.