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Question

How much ATP does the electron transport chain produce?


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Solution

Electron Transport Chain:

  1. It occurs in both photosynthesis and cellular respiration processes.
  2. It takes place in mitochondria.
  3. Steps involved in ETS:
  • A proton gradient is generated across the mitochondrial membrane.
  • In the mitochondrial intermembrane space accumulation of proton takes place.
  • Formation of water and reduction of oxygen here, oxygen acts as a terminal electron acceptor.
  • Synthesis of ATP takes place by the process of chemiosmosis.
  • The synthesis of ATP is catalyzed by the enzyme ATP synthase.

ATP generated through ETS:

  1. One molecule of NADH produces 3 molecules of ATP and one molecule of FADH2 produce 2 molecules of ATP.
  2. In ETS 10 NADH molecules are produced while 2 FADH2 molecules are formed.
  3. Therefore, the total ATP generated from these NADH and FADH2 molecules is 34 molecules.

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