BIOL 212 Lecture Notes - Lecture 1: Carboxylic Acid, Dehydration Reaction, Glycerol

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Hydrocarbons are nonpolar molecules that contain only carbon and hydrogen. Lipids do not dissolve in water because of a major component called a fatty acid (a hydrocarbon chain bonded to a carboxyl cooh functional group) Fatty acids are the key building blocks of lipids. Solid at room temperature because they have extremely long hydrocarbon tails that form stiff solids at room temperature: unsaturated. Highly unsaturated fats are liquid at room temperature. Cis double bonds (c=c is what it would look like) cause kinks in hydrocarbon chains. 3 types of lipids found in cells: fats (triacylglycerols or triglycerides, steroids, phospholipids. Fats are a subset of lips, fats don"t equal lipids. Lipid structure is characterized by a physical property their insolubility in water. This insolubility is based on the high proportion of nonpolar c-c and c-h bonds and relative to polar functions. Composed of 3 fatty acids linked to glycerol. When the fatty acids are polyunsaturated they form liquid tracylglycerols called oils.

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