<prompt> False regarding Cytochrome P-450 enzymes :They are involved in the production of steroidsThey absorb maximum light at 450nm wavelengthThey are present in endoplasmic reticulum of liver cellsThey are non-heme proteins  <response>: cytochrome P450 a microsomal enzyme is a hemoprotein, which serves as the terminal oxidase. The name cytochrome P450 abbreted as P450 or CYP is derived from the spectral propeies of this hemoprotein. In its reduced ferrous form, it binds carbon monoxide to give a complex that absorbs light maximally at 450 nm. They are involved in the metabolism of various drugs The relative abundance of P450s, compared with that of the reductase in the liver, contributes to making P450 heme reduction a rate-limiting step in hepatic drug oxidations. CYP is vital to the formation of cholesterol, steroids and arachidonic acid metabolites Reference: Katzung 13th edition pg: 55 