BIOL 1090 Lecture Notes - Lecture 15: Facilitated Diffusion, Active Transport, Osmosis
21 Aug 2016
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Outer leaflet usually contains glycolipids & glycoproteins (lipids/protens with carbohydrates attached) Note: integrated protein is not the same as integral protein! 2 leaflets (ouside/cytosolic & inside/cytoplasmic) have distinct lipid composition! If higher unsaturated fat content --> transition temperature will decrease! Different areas of the plasma membrane perform different functions! Transition temperature of a lipid = when it changes state! (from solid to gel) Act as a way to deliver things (ex: drugs)! Cytoplasm = liquid inside cell with al the organelles. Different membranes contain different types of lipids & proteins! Lipids can move easily and swiftly laterally, within leaflet! But --> lipid movement to other leaflet is slow! Lipid bilayers do not allow all compounds to pass through freely: small, uncharged molecules --> pass relatively easily. Small areas of membrane that are enriched in certain types of lipids! (ex: cholesterol) Some proteins = attracted & accumulate in the rafts. Membranes have different functions in different cells and within individual cells.
