In the electron transport chain, which undergoes terminal oxidation?
Correct answer: C. Cytochrome a3
- A. Cytochrome b
- B. Cytochrome a
- C. Cytochrome a3
- D. Cytochrome c
Explanation
Complex IV (Cytochrome c Oxidase) is the final enzyme complex in the electron transport chain. Within this complex, the final transfer of electrons to molecular oxygen occurs at a binuclear centre containing cytochrome a3 and a copper ion (CuB). This process is known as terminal oxidation because it is the last step where oxygen acts as the terminal electron acceptor, being reduced to water.
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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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