This is a picture of butter. Butter is an example of a lipid used for energy storage. Lipids are mainly considered fatty acids and their derivatives, but also include carotenoids, steroids, terpenes, and bile acids. Lipids function for energy storage, hormones and vitamins, and forming cell membranes. Even though there are many types of lipids, triglycerides are used for energy storage. Triglycerides have a structure of three fatty acids bonded to glycerol. This combination packs a lot of energy and is stored as fats in animals, including humans. Butter contains triglycerides and therefore is a lipid used for energy storage.
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