The cytochromes of the electron transport chain are
Correct answer: C. iron containing proteins that pass electrons along by changing valency
- A. lipids that store electrons
- B. carbohydrates that carry oxygen
- C. iron containing proteins that pass electrons along by changing valency
- D. enzymes that fix carbon dioxide
Explanation
Each cytochrome carries a haem group whose iron alternates between Fe2+ and Fe3+ as it accepts and passes electrons, releasing energy in steps. They are proteins, not lipids or carbohydrates, and they carry electrons rather than oxygen.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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