<prompt> Nitric oxide synthase:Is inhibited by CaCatalyze a de oxygenase reactionAccept electron from NADH.Requires NADPH FAD, FMN, Heme iron.  <response>: Ans. D. Requires NADPH FAD, FMN, Heme ironNitric oxide synthase is a very complex cytosolic enzyme which requires five redox co-factors: NADPH, FAD, FMN, Heme and tetrahydrobiopterin FH4 . NOS activity depends on increased conc, of Ca2 ions. 