Oxygen is required in aerobic respiration for:
Correct answer: C. Accepting electrons at the end of the electron transport chain
- A. The reduction of hydrogen carriers
- B. The oxidation of glyceraldehyde 3-phosphate
- C. Accepting electrons at the end of the electron transport chain
- D. Maintaining an oxygen concentration gradient in mitochondria
Explanation
The correct answer is Option C: accepting electrons at the end of the electron transport chain. Oxygen's primary role in aerobic respiration is to accept electrons at the end of the electron transport chain, allowing the chain to continue and produce ATP efficiently. This process occurs in the mitochondria, where oxygen combines with electrons and protons to form water.
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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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