steroids
Biosynthesis of Steroids Defi nition A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes which alter membrane fluidity; and as signaling molecule. Classification Sterols Bile acids Vitamin D Male sex hormones Female sex hormones Structure Composed of: seventeen carbon atoms, bonded in four "fused" rings: three six-member cyclohexane rings Function steroids have two principal biological functions:Important components of cell membranes which alter membrane fluidity Act as signaling molecules.Biosynthesis of sterols Biosynthesis of cholesterol Synthesis of mevalonate from acetate Conversion of Mevalonate to Two Activated Isoprenes Condensation of Six Activated Isoprene Units to Form Squalene Conversion of Sq