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(Membrane Carbohydrates, Membrane Proteins, Transport Across Membrane,…
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- Glycoproteins = protein + carb
- Glycolipids = lipid + carb
- Asymmetry: inside ≠ outside
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- Attach to cytoskeleton or ECM
- Example: HIV uses CD4 + CCR5
- Transport Across Membrane
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- Hydrophilic need transport proteins
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- Hypertonic = water leaves cell
- Hypotonic = water enters cell
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- Active Transport (needs ATP)
- Sodium-potassium pump (animal cells)
- Proton pump (plants, fungi, bacteria)
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- Amphipathic (hydrophilic + hydrophobic regions)
- Proteins embedded like mosaic
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- Cholesterol regulates fluidity
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- Adaptation: winter wheat, cold fish
- Exocytosis = vesicle exports materials
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- Endocytosis = vesicle imports
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- Defect = hypercholesterolemia
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