Biology 1202B Lecture Notes - Fluid Mosaic Model, Lipid Bilayer, Unsaturated Hydrocarbon
19 Apr 2013
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Phospholipids are quick/ larger proteins are slow (directed manner may be due to motor proteins of the cytoskeleton) or don"t move at all (anchored by cytoskeleton) Red and green membrane proteins mix freely in experiment. Influenced by temperature (cooling makes the membrane less fluid: membranes rich in unsaturated fatty acids (contain double bonds) are more fluid. Unsaturated hydrocarbon tails have kinks: thickness- approx. Membrane proteins: determine most of the membrane"s specific functions, peripheral proteins not embedded in lipid bilayer (loosely bound to the, integral proteins- penetrate hydrophobic core of lipid bilayer, often spanning either surface) membrane. Hydrophobic regions with nonpolar amino acid (alpha-helices) that contact core. Membrane carbohydrates from another: function: organization as tissues/organs, development and rejection of foreign cells by immune system. Chemical specificity each protein is specific to what it will transport. It id digested when the vacuole fuses with a lysosome: pinocytosis (cellular drinking) cell creates a vesicle around a droplet of ecf (nonspecific)
