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18 Cards in this Set
- Front
- Back
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Selective Permeability
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The plasma membrane allows some substances to cross it more easily than others.
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The Most Abundant Lipid in Membranes
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Phospholipids
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Amphipathic Molecule
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The molecule is both hydrophilic and a hydrophobic region.
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Fluid Mosaic Model
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The membrane is a fluid structure with a mosaic of various proteins embedded in or attached to a double layer (bilayer) of phospholipids
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Integral Proteins
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Penetrate the lipid bilayer; hydrophobic regions of an integral protein consist of one or more nonpolar amino acids.
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Peripheral proteins
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Not embedded in the lipid bilayer at all; they are appendages loosely bound to the surface of the membrane, often to exposed parts of the integral proteins.
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Integrins
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are one type of intergral protein. That combine with animals cells giving them a stronger framework.
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Glycolipids
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Covalantly Bonded Lipids
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Glycoproteins
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Covalantly Bonded Proteins
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Aquaporins
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The passage of water molecules through the membrane in certain cells is greatly facilitated by channel proteins known as
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Transport Proteins
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Hydrophilic Substances can avoid the lipid bilayer by passing through these
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Diffusion
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The movement of molecules of any substance so that they spread out evenly into the available space
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Concentration Gradient
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An area of high concentration will go to an area of low concentration; It is spontaneous.
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Tonicity
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The ability to cause a cell in a solution to gain or lose water.
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Isotonic
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There is nothing wrong with the cell everything is at a balance
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Hypertonic
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The cell has more solute so it will shrivel up.
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Hypotonic
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The solution has less solute so it swells up.
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Three Forms of a Plant Cell
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Turgid (Very Firm)
Flaccid (Limp) Plasmolysis (Withering) |
