Chapter_8_Outline - Ch. 8: Membrane Structure and Function...

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Ch. 8: Membrane Structure and Function I. Membrane Structure A. Phospholipids can form membranes and are amphipathic molecules, having hydrophilic and hydrophobic regions. Phospholipids occur in a bilayer as the main fabric of the membrane, with their hydrophilic sides on the outsides and their hydrophobic regions towards the middle of the membrane. B. Freeze-fracture techniques show that proteins are embedded in the phospholipid bilayer of the membrane. C. The cell membrane is fluid because of the weak hydrophobic interactions holding it together; when steroid cholesterol between phospholipids molecules are at warm temperatures, they make the membrane’s movement much less. D. Integral proteins occur at the hydrophobic core of the lipid bilayer; peripheral proteins occur at the exposed parts of integral proteins for the most part. Carbohydrates in the form of oligosaccharides are on the external side of the plasma membrane. II. Traffic across Membranes A. The hydrophilic and hydrophobic ends of the phospholipids affect the selective permeability of the cell membranes. B. The transport proteins are built into the membrane, and they allow hydrophilic substances to pass through the membrane easily by forming somewhat of a tube. Some transport proteins hold onto the substances and move them across the membrane. C.
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This note was uploaded on 06/15/2010 for the course FDST 4080 taught by Professor Pegg during the Spring '10 term at University of Georgia Athens.

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Chapter_8_Outline - Ch. 8: Membrane Structure and Function...

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