BIOL 1090 Lecture Notes - Lecture 3: Fot, Facilitated Diffusion, Osmosis
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Intro to molecular biology3 march 6th, 2017. The fluid-mosaic model of biological membranes refer lecture 3 slide 2: fluid individual lipid molecules are able to move, mosaic di(cid:448)erse (cid:858)parti(cid:272)les(cid:859) pe(cid:374)etrate the lipid la(cid:455)ers. Integral membrane proteins span the lipid bilayer: lipid-anchored proteins attach to a lipid in the bilayer, peripheral membrane proteins associate with the surfaces of the lipid bilayer. Biological membranes are asymmetrical refer to slide 4: two leaflets have distinct lipid composition. In many plasma membranes, the outer leaflet contains glycolipids and glycoproteins (lipids and proteins with a carbohydrate attached) Structure of biological membranes: all membranes share common properties. Lipids biological membranes vesicles and tubules. It will not change: this situation does not apply to membranes, revise: transition temperature: membrane fluidity. Structure of biological membranes: capable of self-assembly refer slide 8 (demonstrated by liposomes fusing) Different areas of the plasma membrane perform different functions e. g. epithelial cell.