BIOL 116 Lecture Notes - Lecture 1: Peripheral Membrane Protein, Glycerol, Isoprene

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Lipid - carbon-containing compounds found in organisms largely nonpolar and hydrophobic (cid:894)do(cid:374)"t dissol(cid:448)e easily i(cid:374) (cid:449)ater(cid:895) Do dissolve in liquids of nonpolar organic compounds. Nonpolar b/c electrons shared equally in c-h bonds (hydrophobic) Isoprene and fatty acids key building blocks in lipids. Fats - 3 fatty acids linked to a 3-carbon molecule (glycerol), store chemical energy. Vary wrt # of c atoms and double bonds in the tails. Ester linkage - covalent bond formed by condensation rxn between carboxyl and hydroxyl groups. Join fatty acids to glycerol to form fat or phospholipid. Water is a by product of the ester linkage rxn. Fats are not polymers and fatty acids are not monomers. In the rxn that builds a fat, hydroxyl groups react with carboxyl groups. Fatty acids supply the carboxyl, hydroxyls come from glycerol. Steroids - bulky 4-ring structure, amphipathic, plasma membrane. Phospholipids - glycerol linked to a phosphate group, and either 2 chains of isoprene or.

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