Oxygen is used in which step of aerobic respiration:

Correct answer: D. Respiratory chain

  • A. Glycolysis
  • B. Pyruvic acid oxidation
  • C. Krebs cycle
  • D. Respiratory chain

Explanation

The respiratory chain, or electron transport chain (ETC), is located in the inner mitochondrial membrane. It is the only stage in aerobic respiration where oxygen is directly used as the final electron acceptor, forming water.

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