• The first stage of cellular respiration is glycolysis.
  • It does not require oxygen, and it does not take place in the mitochondrion.
  • Enzymes split a molecule of glucose into two molecules of pyruvate.
  • This releases energy, which is transferred to ATP.
  • During this stage, high-energy electrons are also transferred to molecules of NADH.
  • NADH is used in stage III to make more ATP.
  • The energy to split glucose is provided by two molecules.
  • of ATP.
  • This is the most fundamental and primitive pathway for making ATP.
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