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07-2010-10 - Membrane Structure and Function Chapter 7 s...

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Membrane Structure and Function Chapter 7
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Objectives Describe the fluid mosaic model of cell membranes and the roles of proteins in the membranes Define the terms diffusion, osmosis, facilitated diffusion, active transport, exocytosis, endocytosis, isotonic, hypotonic and hypertonic
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Membrane Function Organizes chemical activities of cell separates cells from outside environment controls passage of molecules across membranes partitions organelle function in eukaryotes provides reaction surfaces and organizes enzymes and their substrates
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Membrane Structure Phospholipids of membranes form bilayers phospholipids have polar “head” and nonpolar “tail” form stable bilayer in water with heads out and tails in hydrophobic interior forms barrier to hydrophilic molecules
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Membrane Structure Membrane is fluid mosaic of lipids and proteins proteins embedded in phospholipid bilayer individual molecules free to move laterally some proteins extend through both sides of bilayer cholesterol helps stabilize animal cell membranes at different temperatures
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lipids in membrane are not fixed lipids can move in membrane - semi-fluid nature of membrane two major classes of proteins in membrane integral – transmembrane peripheral - loosely associated with membrane surface Amphipathic: ___________________
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