Answer :
The process is known as Yeast Fermentation. When there is oxygen present, yeast engages in aerobic respiration, converting carbohydrates (a source of sugar) into carbon dioxide and water. Without oxygen, yeasts do fermentation, converting carbohydrates into alcohol and carbon dioxide.
A carbohydrate, such as starch or sugar, is transformed into an alcohol or an acid during fermentation, a process of central metabolism. For instance, in order to produce energy, yeast uses fermentation to transform sugar into alcohol. An organism transforms a carbohydrate, such as starch or sugar, into an alcohol or an acid by yeast fermentation, a process of central metabolism. For instance, in order to produce energy, yeast uses fermentation to transform sugar into alcohol. When yeast cells are dissolved in a glucose solution, bubbles are created because the yeast cells are respiring.
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