BIOL 1090 Lecture Notes - Lecture 16: Membrane Fluidity, Cell Membrane, Biological Membrane
Document Summary
Integral (imbedded: in between the bilayer, through the membrane like a thread (in and out of the membrane, amino acid proteins have charges (amphipathic) regions in the membrane are hydrophobic. Peripheral: on the surface and electrostatic to the surface of the membrane, can be removed and relocated, ionic solution causes a disturbance. Lipid-anchored: hydrophobic bonded to the phosphate group. Membrane has microvilli to increase surface area to get stuff inside the cell. Plasma membranes have glycolipid and glycoprotein (lipid and proteins with carbohydrates attached) on the outer side. Nature of fluid make up the membrane: unsaturated lipids increase fluidity (include double bonds in the lipid, saturated lipids reduce fluidity (only single bonds-more rigid, desaturase controls the fluidity and turns unsaturated into saturated lipids. Temperature: warming increases fluidity = liquid crystal bilayer is ordered, cooling decreases fluidity = crystalline gel bilayer is more ordered, balance between ordered structure (in a certain range) and disordered structure allows:
