Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol. It occurs in yeast and bacteria, and also in oxygen-starved muscle cells, as the means of producing ATP (adenosine triphosphate) with the temporary absence of the electron transport chain. There are several types of fermentation: 1. Lactic Acid Fermentation: This process converts pyruvate into lactic acid. It occurs in muscle cells during strenuous exercise when oxygen supply is limited, and also in certain bacteria used in food production (e.g., yogurt, cheese). Equation: C₆H₁₂O₆ → 2 C₃H₆O₃ + Energy (Glucose → Lactic Acid + Energy) 2. Alcoholic Fermentation: This process converts pyruvate into ethanol and carbon dioxide. It is carried out by yeasts and is used in baking (leavening bread) and the production of alcoholic beverages. Equation: C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂ + Energy (Glucose → Ethanol + Carbon Dioxide + Energy) 3. Acetic Acid Fermentation: This process converts ethanol into acetic acid (vinegar). It is carried out by acetic acid bacteria in the presence of oxygen. Equation: C₂H₅OH + O₂ → CH₃COOH + H₂O (Ethanol + Oxygen → Acetic Acid + Water) Send me the next one 📸