The number of ATP molecules generated per atom of oxygen that is reduced when electrons are passed from NADH or reduced FAD (FADH)to O₂ is called the

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The P/O ratio refers to the number of ATP molecules generated per atom of oxygen that is reduced when electrons are passed from NADH or reduced FADH to O2 during oxidative phosphorylation. This ratio varies slightly depending on the enzyme complexes involved and the organism, but it is typically around 2.5 ATP per NADH and 1.5 ATP per FADH2.

The Number of ATP Molecules Generated Per Atom of Oxygen