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.
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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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