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STRUCTURES INTERNAL TO THE CELL WALL

STRUCTURES INTERNAL TO THE CELL WALL -...

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STRUCTURES INTERNAL TO THE CELL WALL 1. PLASMA (CYTOPLASMIC) MEMBRANE -----lies inside the cell wall and encloses the  cytoplasm. a. Consists of phospolipids and proteins. Phospholipids form a bilayer that consists of 2 layers of  phospholipid molecules. A phospholipid molecule looks like this:   Head-polar and water soluble, hydrophilic (glycerol + phosphate) 2 tails, non-polar, hydrophobic, not water soluble (fatty acids)  They line up like this to form the phospholipid bilayer:   b. Membrane proteins are placed in 2 groups 1) Peripheral proteins---loosely attached to the inner or outer surface of the membrane. Some are  enzymes and some give support to the membrane. These are easily removed. 2) Integral proteins are built into the membrane and cannot be removed without damage. Some of  these extend from one side of the membrane to the other (transmembrane proteins). Some 
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