Ch 5 - Lifes Border The Plasma Membrane Introduction...

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Life’s Border The Plasma Membrane Introduction Importance of the plasma membrane (seen in malfunctioning transport in cystic fibrosis). Overview of major functions. Keeping the goods concentrated, while keeping harmful materials out, requires transport in two directions. Communication with other cells. Four Components of the Plasma Membrane Phospholipid Bilayer. Phospholipids: two fatty-acid chains and a polar phosphate group attached to glycerol. Arrangement of phospholipids in water (two layers, heads pointed out, tails pointed in). Permeability of bilayer: lipid center is a barrier to passage of large hydrophilic molecules, but it allows nonpolar, hydrophobic molecules to pass. Four Components of the Plasma Membrane Cholesterol. Prevents passage of some small molecules and adds fluidity. Proteins. Integral (span entire membrane) and peripheral (lie on either side) with diverse range of functions.
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