BIO 201 Chapter 5: Membrane Transport
8 Aug 2016
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4/10/13: divides inside of cell from outside. Hydrophilic part outside facing water (more polar side chains). Inside is proteins- folded so that what faces lipid areas are non-polar side chains of amino acids. Shape is dictated by proteins- that gives it structure, not membrane itself. Hydrophobic core- things that dissolve in water won"t get across membrane very well. Polar dissolves well on outside, non-polar dissolves well on inside: charged parts on end. No dipoles in there- hydrophobic area in middle. Hydrophilic on outside: polar on outsides, fatty acids strung out in-between, pink proteins. Ch is important in providing solution to packing problem, allows things to diffuse in there. Individual phospholipids can rotate/spin, how quickly depends on how kinked it is. Can laterally diffuse, but cannot vertically flip (need kinase?: as protein stretches from side to side, goes into helical structure. Some involved in allowing things to get across membrane that usually wouldn"t easily- regulate traffic.
