<Tr> <Td> Glycolysis preparatory phase </Td> <Td> </Td> <Td> − 2 </Td> <Td> Phosphorylation of glucose and fructose 6 - phosphate uses two ATP from the cytoplasm . </Td> </Tr> <Tr> <Td> Glycolysis pay - off phase </Td> <Td> </Td> <Td> </Td> <Td> Substrate - level phosphorylation </Td> </Tr> <Tr> <Td> 2 NADH </Td> <Td> 3 or 5 </Td> <Td> Oxidative phosphorylation: Each NADH produces net 1.5 ATP (instead of usual 2.5) due to NADH transport over the mitochondrial membrane </Td> </Tr> <Tr> <Td> Oxidative decarboxylation of pyruvate </Td> <Td> 2 NADH </Td> <Td> 5 </Td> <Td> Oxidative phosphorylation </Td> </Tr>

Net number of atp produced in aerobic respiration