Fermentation is
Correct answer: B. Fermentation occurs in the absence of oxygen
- A. Fermentation occurs in the presence of oxygen
- B. Fermentation occurs in the absence of oxygen
- C. Fermentation produces large amounts of energy
- D. Fermentation completely breaks down glucose into carbon dioxide and water
Explanation
Fermentation is a type of anaerobic respiration (without oxygen) in which glucose or other carbohydrates are broken down incompletely. It releases energy in the form of ATP and produces byproducts like lactic acid (in animals) or ethanol and CO₂ (in yeast). Unlike aerobic respiration, it does not fully oxidize glucose into carbon dioxide and water.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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