NADH + H+ + 3ADP + 3Pi + ½ O2 ⎯⎯→ 3NAD+ + H2O + 3ATP. The equation has been summarized:
Correct answer: B. Respiratory chain
- A. Glycolysis
- B. Respiratory chain
- C. Krebs cycle
- D. Photosynthetic electron transport chain
Explanation
The correct answer is the respiratory chain. This process, also known as the electron transport chain, is the final stage of cellular respiration occurring in the mitochondria. It uses NADH and oxygen to produce ATP and water, aligning with the equation provided. Glycolysis and the Krebs cycle are earlier stages of cellular respiration, with glycolysis occurring in the cytoplasm and the Krebs cycle in the mitochondrial matrix, neither directly performing the reactions in the equation. The photosynthetic electron transport chain is part of photosynthesis in chloroplasts, not cellular respiration.
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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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