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Relative abundances of phosphoglycerides and sphingolipids differ between membranes of ER and Golgi. Phospholipids synthesized in ER and sphingolipids synthesized in Golgi. Proportion of sphingomyelin as a percentage of total membrane lipid phosphorous is about six times as high in the Golgi membranes.
Phospholipids. Phospholipids are abundant in membranes and form the framework in which the other components of the membrane are embedded. Refer to the figure to the right.At the center of a phospholipid lies glycerol, which is a small three carbon molecule. A fatty acid is bonded to each of two carbons of the glycerol molecule.holesterol. Cholesterol is a lipid molecule comprised almost entirely of carbons and hydrogens. At one end is a single oxygen molecule, which is part of a hydroxyl group. Cholesterol is most abundant in plasma membranes, and influences the physical properties of the membrane.