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Definition
| main component of cell membranes |
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| gives membrane its fluid properties |
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Definition
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| In the fluid mosaic model, the membrane is a mosaic of |
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Definition
| phospholipids, glycolipids, sterols, and proteins |
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| Most phospholipids and some proteins can |
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Definition
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Definition
| shows some proteins drift within membrane |
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| membrane crossing mechanisms |
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Definition
| diffusion across lipid bilayer, passive transport, active transport, endocytosis, exocytosis |
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Definition
| means the number of molecules or ions in one region is different than the number in another region |
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| In the absence of other forces, a substance moves |
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Definition
| from a region where it is more concentrated to one where it's less concentrated |
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Definition
| the net movement of like molecules or ions down a concentration gradient |
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| Although molecules collide randomly, the net movement is |
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Definition
| away from the place with the most collisions |
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Term
| factors affecting diffusion rate |
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Definition
| steepness of concentration gradient, molecular size, temperature, electrical or pressure gradients |
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Term
| steepness of concentration gradient |
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Definition
| steeper gradient, faster diffusion |
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Definition
| smaller molecules, faster diffusion |
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Definition
| higher temperature, faster diffusion |
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Definition
| span the lipid bilayer, interior is able to open to both sides, change shape when they interact with solute |
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| move water-soluble substances across a membrane |
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Definition
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Definition
| doesn't require energy inputs, solutes diffuse through a channel inside the protein's interior |
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| Net movement s down concentration gradient |
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Definition
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Term
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Definition
| require ATP, protein is an ATPase pump, pumps solute against its concentration gradient |
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Term
| how do proteins get to the surface |
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Definition
| vesicle membrane fuses with plasma membrane |
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Term
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Definition
| pinocytosis, bulk phase, receptor-mediated, phagocytosis |
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Term
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Definition
| exocytosis and endocytosis continually replace and withdraw patches of plasma membrane |
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