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search engines. OCR for page 44 Page 44 5 Lipids Lipids are
organic compounds with limited solubility in water. They are
present in biologic systems mainly as energy stores within cells
or as components of cell membranes. The nonpolar lipids occur
mainly as esters of fatty acids that are virtually insoluble in
water and enter metabolic pathways only after hydrolysis. The
triacylglycerols (also called triglycerides or fats) are
composed of three fat