Cholesterol is an extremely important biological molecule that has roles in membrane structure as well as being a precursor for the synthesis of the steroid hormones, the bile acids, and vitamin D.Both dietary cholesterol, and that synthesized de novo, are transported through the circulation in lipoprotein particles. Introduction to Cholesterol Metabolism. The structure of cholesterol has three main regions; the hydrocarbon chain, the ring structure with four rings and the characteristic hydroxyl group. The hydroxyl group (-OH) in cholesterol is aligned with the phosphate head of the phospholipid on the cell membrane, which the rest of the cholesterol goes with the fatty acid of … Cholesterol structure. Cholesterol: A type of fat made by the liver. > The structure of cholesterol with its numbering is shown below. Each chiral carbon must have four different groups. (Adapted from en.wikipedia.org) Remember that bond-line structures don't show the hydrogen atoms that are attached to carbon. There are eight chiral centres in cholesterol. The molecule is extremely hydrophobic. 25-Hydroxycholesterol. The 2D chemical structure image of cholesterol is also called skeletal formula, which is the standard notation for organic molecules. Lipoproteins: A round structure containing cholesterol and triglycerides on the inside, surrounded by a protein coat on the outside. 5-Cholestene-3beta,25-diol. At the molecular level, cholesterol possesses a slick and rigid structure. The only hydrophilic group you have on the molecule is the hydroxyl group on ring 1 25-OHC. These include bile There is no internal plane of symmetry, so every carbon atom is different. Cholest-5-ene-3beta,25-diol Due to the presence of the hydrophilic hydroxyl group and the hydrophobic hydrocarbon region cholesterol is termed as an amphipatic molecule. 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