Biology 2581B Study Guide - Quiz Guide: Aqueous Humour, Pinocytosis, Hyperplasia
2 May 2020
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Document Summary
Small units bound by a plasma membrane (or a cell wall) Mitogen= chemical substances normally a protein that stimulates a cell to divide. Plasma membrane separates the cellular contents from the outside. Internal membrane separates the content of different organelles from the rest of the cell. Membrane lipids are ampholytic and they associate to form a permeability barrier that most solutes cannot freely diffuse across. Amphiphilicity of membrane lipids means that they readily self-associate in water. Cylindrical shape means that they favour a bilayer of two leaflets, rather than a micelle. The propensity to form membrane sheets favour the formation of liposomes (membrane lipid balls) Acyl chain can flex within the bilayer. Membrane lipids can rotate within the bilayer. Membrane lipids can diffuse laterally within the leaflet. Flip-flop, the movement of membrane lipid from one leaflet to the other is rare. The major lipid components of most biological membrane are also arranged asymmetrically between the two leaflets of the bilayer.
