Lipids

Water-insoluble biomolecules; Types: Fatty acids (Hydrocarbon chain + carboxyl group; Saturated = no double bonds, Unsaturated = one or more C=C double bonds); Glycerol (Trihydroxy propane); Triglycerides (Esters of fatty acids and glycerol); Phospholipids (Contain phosphorus, found in cell membranes, e.g., Lecithin).