The three carbon molecule that has attached functional Lipids is called glycerol. Lipids are a diverse group of organic compounds that are insoluble in water but soluble in organic solvents. They are essential for the structure and function of cells and are involved in a variety of biological processes, including energy storage, membrane formation, hormone production, and signaling. Glycerol is a three-carbon alcohol that is the backbone of triglycerides, the most common type of lipid. Triglycerides are composed of three fatty acids attached to a glycerol molecule.