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19 Cards in this Set
- Front
- Back
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Fluidity
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Not a rigid structure. Individual molecules remain close to one another yet have the ability to move within a membrane.
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Semifluid
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Motion of phospholipids is two-dimensional and occurs within the plane of the membrane.
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Lipid Raft
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A group of lipids that float together as a unit within a larger sea of lipids.
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Unsaturated
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When a double bond is present, and the fatty acyl tail is kinked. Makes it difficult for tails to interact and makes bilayer more fluid.
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Cholesterol
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Short, rigid molecule that helps stabilize membranes.
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Osmosis
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The movement of water across a membrane.
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Isotonic
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When levels of solutes on both sides of the plasma membranes are equal.
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Hypertonic
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When the level of solutes outside the cell is higher than the level inside the cell.
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Hypotonic
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When the level of solutes on the outside of the cell is lower than the level inside the cell.
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Selective Permeability
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The ability of the plasma membrane to allow the passage of some ions and molecules but not others.
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Diffusion
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When a substance moves from a location of high levels to a location of low levels.
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Facilitated Diffusion
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When a transport protein provides an opening for a substance to diffuse across a membrane.
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Passive Transport
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Transport of a substance across a membrane that does not require an input of energy. Examples: diffusion, and facilitated diffusion.
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Active Transport
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Moves a substance from an area of low level to one of higher level with the aid of a transport protein. Requires input of energy, such as ATP.
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Polarity
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Nonpolar substances diffuse faster than polar ones.
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Concentration Gradient
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The concentration of a solute is higher on one side of a membrane than the other.
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Osmosis Lysis
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When a cell ruptures as a result of taking in too much water.
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Plasmolysis
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Occurs when the plasma membrane is pulled away from the cell wall in a plant cell because of water exiting the cell caused by the fluid outside the cell being hypertonic.
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Transport Protein
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Transmembrane proteins that provide an opening for the movenent of ions and hydrophilic molecules across the phospholipid bilayer.
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