What happens to oxygen in the electron trasfer chain in respiration?
Correct answer: C. It is reduced to water
- A. It is released asgas
- B. lt forms CO2
- C. It is reduced to water
- D. It is used as an electron carier
Explanation
In the electron transport chain (ETC) of cellular respiration, oxygen (O_2) serves as the final electron acceptor. Electrons, which have been passed down the chain from NADH and FADH2, are ultimately transferred to oxygen. Along with protons (H^+), oxygen is reduced to form water (H_2O). This process is crucial for generating the proton gradient that drives ATP synthesis.
This question appeared on the ETEA MDCAT 2005 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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