Which of the following is the final acceptor of electron in respiratory chain?
Correct answer: C. Oxygen
- A. Cytochrome a
- B. Cytochrome b
- C. Oxygen
- D. Hydrogen
Explanation
The final electron acceptor in the respiratory chain is oxygen (O2). During oxidative phosphorylation, electrons are passed along a series of membrane-bound protein complexes, which pump protons (H+) across the inner mitochondrial membrane, creating an electrochemical gradient. At the end of the electron transport chain, the electrons are transferred to oxygen molecules, which combine with protons to form water (H2O). This process generates a large amount of energy, which is used to synthesize ATP from ADP and inorganic phosphate.
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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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