AP BIOLOGY

Detailed explanation-1: -In yeast, the glucose breaks down anaerobically to produce alcohol as the end product and carbon dioxide gas as the byproduct. Whereas, in the case of Lactobacillus bacteria, lactic acid is produced anerobically.

Detailed explanation-2: -If no oxygen is available, yeast will switch over to a process called anaerobic respiration-in this process, glucose (sugar) is fermented to produce energy, carbon dioxide, and ethanol.

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: -Alcoholic fermentation is a complex biochemical process during which yeasts convert sugars to ethanol, carbon dioxide, and other metabolic byproducts that contribute to the chemical composition and sensorial properties of the fermented foodstuffs.

Detailed explanation-5: -Once the yeast and sugar have dissolved, pour the mixture into the bottle. You’ll notice the water bubbling as the yeast produces carbon dioxide. 4.