Biology 1202B Chapter Notes - Chapter 5: Peripheral Membrane Protein, Fluid Mosaic Model, Cell Membrane
6 Feb 2013
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Membranes are not rigid with molecules locked into place but rather consist of fluid lipid molecules in which proteins are embedded and float freely. Bilayer vibrates, flex back and forth, spin around there long axis move side ways and exchange places within the same bilayer half. Exchanging places within a layer occurs millions of times a second. Wide assortment of different types of proteins each with a specific function. Proteins involved in transport and attachment the proteins move more slowely in the fluid environemtn of the membrane small number of membrane protein anchor cytoskeleton filament to the membrane and thus do not move. Proportion of lipid to protein varies considerable depending on the type of membrenae inner mitochondrial membranes large percent protein: plasma membrane equal amount, myeline membrane large percent lipid. The lipid molecule is the foundation of all biological membranes. Keep membranes in a fluid state is important to membrane function.
