In respiration, the coenzymes NAD and FAD function as carriers of
Correct answer: A. hydrogen atoms and electrons removed from the substrate
- A. hydrogen atoms and electrons removed from the substrate
- B. carbon dioxide released by the Krebs cycle
- C. oxygen from haemoglobin
- D. phosphate groups for ATP synthesis
Explanation
Dehydrogenase enzymes strip hydrogen from intermediates and hand it to NAD or FAD, which carry the electrons to the electron transport chain. They do not carry gases or phosphates, so their role is purely that of a reusable shuttle.
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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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