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1.3 IB Bio
Membrane Structure
| Term | Definition |
|---|---|
| Fluid Mosaic Model | N/A |
| Davson-Denielli Model | -Cell membranes consist of a phospholipid bilayer coated in protein -Explained how a 10nm thick membrane could be an effective barrier against substances -Two dark bands with lighter band in between -Proteins dark in electron micrograph |
| Freeze etched electron micro graphs | -Rapid freezing and fracturing of cells, occurs in weak regions (occurred through middle of membrane) |
| Structure of membrane proteins | -Structure of membrane proteins; are varied and globular in shape (not likely to form a continuous layer) -Some proteins have hydrophobic sections, they are attracted to hydrocarbon tails in center of membrane |
| Fluorescent antibody tagging | -Antibodies will attach to particular proteins -Antibodies are fluorescently labeled green or red -One cell labeled green and another red (fused together with electric discharge) -After time red and green were evenly distributed throughout larger cell |
| Phospholipids form bilayers | -Hydrophobic fatty acid tails repel water and are attracted to each other -Hydrophilic phosphate heads attract water and orient to face water (extra and intracellular fluid) |
| Membrane protein diversity | -Parts of proteins that face outside the membrane (into the cell or towards the extra cellular fluid) are polar -Parts of proteins that face the hydrocarbon are non-polar -Some proteins will be associated with polysaccharides (glycoproteins/antlers) |
| Hormone binding sites | -Immobilized enzymes -Cell adhesion -Cell to cell communication -Channels for passive transport -Pumps for active transport |
| Cholesterol in animal cell membranes and mammalian membranes | -Reduces membrane fluidity by reducing phospholipid movement at moderate temps but it also hinders solidification at low temps -Also helps prevent some ions such as sodium from crossing the membrane because it is hydrophobic |
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averyschwarz
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