BIOL 1111 Lecture Notes - Lecture 2: Fluid Mosaic Model, Lipid Bilayer, Cell Membrane
30 Oct 2017
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*all life occurs in, on, or across membranes (plasma membrane) 20-30% ( ) of your genes encode membrane protein. 70% of all medications exert effects by binding to membrane proteins. Functions as the outer boundary; isolates cell. Compartmentalization - dividing up different areas of the cell which allows specific areas to undergo specialized processes. Plasma membrane is common to all cells, all structures are bounded by a phospholipid bilayer. Separates the internal living cytoplasm (icf = intracellular fluid) from the external living environment (ecf = extracellular fluid). External and internal (cytoplasmic) surface is lined with hydrophilic polar heads. Boundary between the 2 is nonpolar, which is where the hydrophobic fatty-acid polar tails span and create a boundary between the two. (freeze fracture allows you to separate the ecf and icf from. What is imbedded in the phospholipid bilayer? each other) Fluid layer moving across the surface of the cell (consistency like olive oil)
