BIOB10H3 Lecture 2: Macromolecules

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# of outer shell electrons determines chemical properties of an element. Molecules = 2 or more atoms in a definite arrangement held together by chemical bonds, made by living organisms biochemical. Centred around c , size of electronic structure of c = ideally suited to generate large biological molecules. Hydrocarbons = simplest group of biological molecules. Functional groups = particular atom groupings that behave as a unit, affects the properties of biomolecules, change chemical reactivity (dictated by # and types of functional groups) Lipids: large nonpolar molecules, mainly composed of c,h & o, dissolve in organic solvents, fats, steroids, phospholipids, fats: 3 fatty acid chains linked to glycerol molecule by ester bonds (if double bonds present, fatty acid = unsaturated. & organelle membrane, hydrophilic on 1 end and hydrophobic on other (= amphipathic), + charged choline group attached to phosphate = phosphatidyl choline, arrange into bilayer (hydrophobic tails inwards and hydrophilic heads outwards)

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