In respiration, the oxidation of a substrate molecule essentially means the
Correct answer: C. loss of electrons and hydrogen from it
- A. addition of hydrogen atoms to it
- B. removal of oxygen from it
- C. loss of electrons and hydrogen from it
- D. gain of electrons by it
Explanation
Biological oxidation is the removal of hydrogen, whose electrons are passed to NAD or FAD, so dehydrogenation and oxidation are the same event. Adding hydrogen is reduction, the reverse reaction, which is what NADH does when it donates electrons later.
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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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