<prompt> P : O ratio for FAD is -32?51?54  <response>: Ans. is c i.e., 1?5o The P : O ratio is a measure of the number of high energy phosphates i.e., number of ATP molecules synthesized per atom of oxygen consumed or per molecule of water is producedo The P : O ratio for oxidation of metabolites that yield NADH is 2?5 and the ratio for those that yield FADH2 is 1?5. 