NATS 4210 Lecture Notes - Lecture 2: Integral Membrane Protein, Membrane Fluidity, Peripheral Membrane Protein
5 Nov 2016
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Lecture 2: transport of substances across the cell membrane. Concentration- amount of solute dissolved in a given volume of solvent. Concentration gradient difference in [substance] between two areas or across a membrane. Can also take form of voltage and electricity (affect movement of charged substances) The plasma membrane- an important evolutionary function because it allowed several functions in the cell to be compartmentalized. Communication between the cell and its environment. Composed of mainly lipids + proteins + carbohydrates attached to and/or embedded within the membrane: glycolipids lipids with carbohydrate attached by a glycosidic bond (served as markers for cellular recognition and provide energy) Carbohydrate groups are attached to many membrane proteins and lipids. Individual phospholipids are not chemically bonded to each other -> weak van der waal"s forces (they can move easily but not flip as much) Amount of cholesterol in the membrane determines membrane fluidity too.
