BIL 250 Chapter 11: Chapter 11
13 Nov 2016
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Document Summary
Is a protein-studded, fatty film so thin that it cannot be seen directly in the light microscope. A bilayer that consists of two-ply sheet of lipid molecules about 5nm-50nm atoms thick into which proteins have been inserted. When the cell grows and changes shape, so does its membrane. Enlarges in area by adding new membrane without losing its continuity. It has the ability to deform without ever losing its continuity as well as it can deform without tearing. Note: if the membrane is pierced it neither collapses like a balloon nor remains torn; instead, it quickly reseals. It"s not only a barrier, but it has a larger purpose. Very selective and let only certain things in or out. And to do this exchange it is helped by highly selective channels and transporters. Also, there are other proteins in the membrane act as sensors or receptors, they help the cell send or receive signals from its surrounding.
