BIOL107 Lecture Notes - Lecture 5: Phase Transition, Close-Packing Of Equal Spheres, Phospholipid

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Membrane components: phospholipids, proteins, glycoproteins (membrane proteins that have a sugar attached *important function in cell recognition*), glycolipids, and cholesterol. Variability in the type and number of these di erent components gives di erent membranes speci c properties. Biological me brains are uid at physiological temperature. Fluid dynamic model of phospholipids - phospholipids drift laterally within the phospholipid bilayer. High temp will cause an increase in uidity, and eventually gaps in the membrane form if temp gets high enough (essentially the membrane structure falls apart a little bit). All membranes will turn solid if temp goes low enough > called phase transition (turning from solid to liquid and vice versa). Temp at which phase transition occurs depends on the composition of the membrane: 1. Length of fatty acids in the phospholipid: 2. Shape of fatty acids in the phospholipid (in uenced by double bonds) > State change from solid to liquid will change at a lower temp: 3.

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