• Citric acid is also the first product formed in the Krebs cycle, and therefore this acid occurs in the metabolism of virtually all living things.
  • The energy stored in pyruvate is transferred to NADH and FADH2, and some ATP is produced.
  • High-energy electrons are also released and captured in NADH.
  • Carbon dioxide is also released as a waste product of these reactions.
  • After the original glucose molecule has been broken down completely, the energy from its chemical bonds has been stored in a total of 16 energy-carrier molecules.
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