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MHT CET Medical202624 April 2026Morning ShiftBiologyRespiration in PlantsActual

The ultimate electron acceptor in ETS in aerobic respiration is ___________ and it reacts with protons to form ________.

Options

  1. ACytochrome a, water
  2. BMolecular oxygen, metabolic water
  3. CGlucose, Carbon di-oxide
  4. DHydrogen, acetaldehyde

Correct answer

B. Molecular oxygen, metabolic water

Step-by-step solution

In the electron transport system (ETS) of aerobic respiration, the final or ultimate electron acceptor is molecular oxygen. Oxygen accepts electrons from cytochrome c oxidase (Complex IV) and reacts with protons from the mitochondrial matrix to form metabolic water. The reaction is 1 2 O₂ + 2H^+ + 2e^- H₂O . Answer: Molecular oxygen, metabolic water

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