We form 1.5 ATP per single NADH that is, oxidized that is produced in the glycolytic pathway. So from this result, we can conclude the following. Since the mitochondrial membrane is impermeable to NADH, the solution to actually transporting the NADH is not actually moving the NADH, but rather transporting those electrons onto a different molecule, then moving that molecule across the outer membrane and using that molecule to move the electrons onto this enzyme, which then moves those electrons onto Ubiquinone. So, since the mitochondrial membrane is a permeable to NADH molecules, the solution is to extract electrons from NADH produced in a glycolytic pathway and ultimately pass them down to Ubiquinol to form Ubiquinone and then Ubiquinone. Ubiquinol essentially completely bypasses complex one because it gives the two electrons onto complex three. And since NADH from glycolysis bypasses complex one, it only produces a net result of 1.5 ATP molecules rather than the 2.5 which are produced from the NADH that is formed in the citric acid cycle that takes place in the matrix of the mitochondria.