Answer:
due to the variability of the flow of protons and electrons through the ATPase
Step-by-step explanation:
The total number of ATP is not known exactly and is due to variance in the degree of coupling between the flow of protons through the ATPase and electron transport. ATP – Adenosine triphosphate, the energy currency of the cell is organic compound composed of the phosphate groups, adenine, and sugar ribose.