BIOL 2020 Lecture Notes - Lecture 2: Glycerol, Phospholipid, Lipid Raft

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*made up of polymers that are made up from monomers (not lipids) Due to the 4 valance electrons, carbon (c) is the core of all these macromolecules. Monosaccharide -> disaccharide -> oligosaccharides (3-10 mono): attached to proteins or lipids (important for cell to cell recognition and protein trafficking) -> polysaccharide (repeating monomers): important for energy storage and cellular structure. Some important polysaccharides: cellulose (beta bonds, very hard to digest), starch, and glycogen: lipids. They dissolve in organic solvents and do not dissolve in water. Fats (triglyceride): 3 fatty acid tails attached to glycerol. Fatty acids are amphipathic (some parts are soluble and some parts are not); but a triglyceride isn"t (no exposed carboxyl group). Steroid: important for hormones (a precursor) also for wall cell fluidity. (also amphipathic). Phospholipids: polar head + phosphate linkage + glycerol backbone + fatty acid chances (also amphipatic): proteins. Working molecule of the cell (catalyst and mechanical work) they are also important for structure.

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