What happens to oxygen in the electron transport chain?
Correct answer: A. It is reduced to water
- A. It is reduced to water
- B. It is converted to gas
- C. It is used as an electron carrier
- D. It supplies energy to produce ATP
Explanation
Oxygen plays a crucial role in the electron transport chain as the final electron acceptor. It combines with electrons and protons at the end of the chain to form water, a process known as reduction. This is essential for maintaining the flow of electrons through the chain, which in turn helps establish the proton gradient necessary for ATP production. The other options are incorrect because they either misrepresent oxygen's role in the electron transport chain or attribute functions to it that it does not perform.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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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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