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| Cell Membrane |
| Body cells are surrounded by a thin covering
called the plasma (cell) membrane. The cell membrane
is composed of two layers of phospholipid molecules (the phospholipid
bilayer). Within this layer are the plasma proteins. The
integral proteins serve as channels through which substances
are selectively transported into and out of a cell. When bound
to chains of oligosaccharides the integral proteins
also serve as receptor sites. Peripheral proteins are
loosely bound to the membrane surface. Also present are cholesterol
molecules and glycolipids. |
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