01:119:115 Lecture Notes - Lecture 6: Plasmolysis, Phagocytosis, Lysosome
18 Apr 2016
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Document Summary
Amphipathic = hydrophobic tails and hydrophilic head. Membrane = fluid structure + mosaic of various proteins. Fatty acid length: shorter more fluid. Fatty acid saturation: unsaturated more fluid. At warm temps stabilise membrane fluids. Proteins in membrane -> form pattern (tiles) Membrane regulates movement of molecules in/out of the cell using. Dissolve in cross the lipid bilayer. Do not dissolve in do not cross membrane easily. Allow passage of hydrophilic substances across the membrane. Diffusion of a substance across a membrane. At dynamic equilibrium no net movement but molecules still moving evenly in both directions. Diffusion of substance across the lipid bilayer. Small, nonpolar molecules hydrophobic substances includes hydrocarbons. Including water, small enough to slip past fatty acid tails. Osmosis: diffusion of water across a selectively permeable membrane. Water diffuse from lower to higher solute concentration. Until the solute concentration is equal on both sides. From higher to lower concentration of water. Water balance of cells without cell walls.
