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While fat and oil lipids have three fatty acid chains joined to a glycerol molecule, phospholipids have two chains joined to the glycerol with a phosphate group, which you might have guessed from the first part of this lipid type's name. Phospholipids are the main constituent of cell membranes.
Four important classes of organic moleculesâcarbohydrates, lipids, proteins, and nucleic acidsâare discussed in the following sections. Carbohydrates. Carbohydrates are classified into three groups according to the number of sugar (or saccharide) molecules present: A monosaccharide is the simplest kind of carbohydrate.