| A | B |
|---|
| diffusion | The net movement of particles from an area of higher concentration to an area of lower concentration. |
| dynamic equilibrium | A condition in which there is continious movement but no over all change. |
| osmosis | Water molecules move through a membrane from a high to a low concentration. |
| isotonic solution | a solution in which the concentration of dissolved substances is the SAME as the concentration inside the cell. |
| hypotonic solution | A solution in which the concentration of dissolved substances is LOWER than the concentration inside the cell. |
| hypertonic solution | A solution in which the concentration of dissolved substances is HIGHER than the concentration inside the cell. |
| turgor pressure | Pressure that exists in a cell. |
| contractile vacuoles | Name for protists that contain organelles. |
| plasmolysis | Loss of water from a cell resulting in a drop in turgor pressure. |
| passive transport | Movement of particles across membranes by diffusion. |
| transport proteins | Allow needed substances or waste materials to move through the plasma membrane. |
| facilitated diffusion | The passive transport of materials across the plasma membrane by means of transport proteins. |
| active transport | Transport of materials against a concentration gradient which requires energy. |
| endocytosis | A process in which the cell surrounds and takes material from its environment. |
| exocytosis | Method to expel wastes & secrete substances produced by the cells. |
| selective permeability | Property of a membrane that allows some materials to pass through while keeping others out. |
| phospholipid | A small organic section attached to a phosphate group on a membrane lipid. |
| fluid mosaic model | a structure made up of many simular molecules that are free to move side-ways w/in the membrane. |
| concentration gradient | The measure of the difference in concentration across a distance. |
