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Ch. 8 Membrane Structure and Function

Ch. 8 Membrane Structure and Function. AP Biology Crosby High School. Two types of Proteins. Integral protein Penetrate through the lipid bilayer Peripheral protein Loosely bound to surface of membrane. Membrane Carbohydrate. Cell-cell recognition Sorts cells during development

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Ch. 8 Membrane Structure and Function

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  1. Ch. 8 Membrane Structure and Function AP Biology Crosby High School

  2. Two types of Proteins • Integral protein • Penetrate through the lipid bilayer • Peripheral protein • Loosely bound to surface of membrane

  3. Membrane Carbohydrate • Cell-cell recognition • Sorts cells during development • Identify foreign cells • Oligosaccharides • Bound to either lipids or proteins • Act as markers to distinguish one cell from another

  4. Membrane Reversal • Extracellular face is the same as inside face of ER, Golgi and Vesicles • Flips inside-out when incorporated into cell membrane

  5. Permiability • Lipid bilayer • Hydrophobic compounds cross membrane • Polar or charged particles can not • Transport proteins • Creates hydrophilic channels • Some bind and move • Specificity

  6. Passive Transport • Down concentration gradient • Uphill vs. downhill • Proceed to equilibrium • Increases Entropy by mixing • Does not use ATP • This does not require energy therefore ATP is not used

  7. Osmosis • Diffusion of water • Relies on solute concentration • Hypotonic: lower solute concentration • Hypertonic: higher solute concentration • Isotonic: same solute concentration • Moves from Hypotonic  Hypertonic

  8. Osmoregulation and Cell Survival • Paramecium use contractile vacuole • Cells with walls • Turgid • Flaccid • Plasmolysis

  9. Facilitated Diffusion • Transport proteins create channels • Aquaporins • Gated channels • Bind and change shape

  10. Active Transport • Requires work to transport uphill • Expends energy • Energy is provided by ATP • Sodium-potassium pump

  11. Passive vs. Active Transport

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