Which one of the following is the stage of cellular respiration for which oxygen is not essential:
Correct answer: A. Glycolysis
- A. Glycolysis
- B. Pyruvate oxidation
- C. Krebs's cycle
- D. Electron Transport Chain
Explanation
The stage of cellular respiration for which oxygen is not essential is glycolysis. Glycolysis is the first step in cellular respiration and takes place in the cytoplasm of the cell. It does not require oxygen and can occur under both aerobic (with oxygen) and anaerobic (without oxygen) conditions. In the absence of oxygen, glycolysis is followed by either fermentation (in anaerobic conditions) or the continuation of the aerobic respiration process (if oxygen is available).
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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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