Bio 1510 - 5 - Bio 1510 Basic Life Mechanisms Fall 2008 Dr....

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Unformatted text preview: Bio 1510 Basic Life Mechanisms Fall 2008 Dr. Rasheeda Zafar Chapter # 5 Membranes Membranes Active and Passive Transport Active and Passive Transport 1 Fluid Mosaic Model Fluid Mosaic Model Membrane Phospholipid bilayer Fluid Visible by Freeze fracture TEM Globular proteins inserted in bilayer Integral Peripheral Cell surface markers Cholesterol (animal) 2 Phospholipids Phospholipids 3 Glycerol a 3-carbon polyalcohol backbone 2 Fatty acids attached to the glycerol Phosphate group attached to the glycerol Phospholipids Phospholipids 4 Fatty Acids Fatty Acids Nonpolar Carbon and hydrogen chains Hydrophobic (water-fearing) On the inside Phosphate group Phosphate group Polar Hydrophilic (water-loving) On both surfaces of bilayer Phospholipid Bilayers Phospholipid Bilayers 5 Hydrogen bonding of water holds the 2 layers together Individual phospholipids and unanchored proteins can move through the membrane Saturated fatty acids make the membrane less fluid than unsaturated fatty acids Warm temperatures make the membrane more fluid than cold temperatures Membrane Proteins Membrane Proteins 6 Transport Carrier Channel Enzymes Receptors Cell recognition Cell adhesion Cytoskeletal attachment Peripheral Membrane Proteins Peripheral Membrane Proteins 7 Anchored to a phospholipid in one layer of the membrane Possess nonpolar regions that are inserted in the lipid bilayer Are free to move throughout one layer of the bilay er Integral Membrane Proteins...
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Bio 1510 - 5 - Bio 1510 Basic Life Mechanisms Fall 2008 Dr....

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