Chapter 5 - Chapter 5 Cell Membrane Structure and Function...

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Chapter 5 Cell Membrane Structure and Function The cell membrane is usually the outermost barrier of the cell o Except cells with cell walls Plants – cellulose Fungi – chitin Bacteria – chitin plus protein Cell wall is mainly for structural support and production, usually doesn’t act as a barrier to molecules The plasma membrane o Contains the cell but still allows the cell to interact with the environment o Isolate cell environment o Regulate exchange between inside and outside o Communicate with other cells o Identify the cell type Cell identification o Membrane proteins provide a “fingerprint” for the cell type o HIV binds to cell receptors that are present on cells inside the body, but not present on skin cells Called CD receptors The plasma membrane at the boundary of every cell that acts as a selective barrier, thereby regulating the cells chemical environment o Made primarily of lipids o
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