One NADH produces 2.5 ATP, whereas one FADH2 produces two ATP.
One molecule of NADH yields about 2.5 ATP while on the other hand, one molecule of FADH2 produces two ATP molecules. This ATP molecule is further used for performing different activities by the cell.
In conclusion, One NADH produces 2.5 ATP, whereas one FADH2 produces two ATP.
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