front 1 The diffusion of a substance across a biological membrane is what? | back 1 Passive transport, because no energy is expended by the cell to make it happen |
front 2 What is osmosis? | back 2 The diffusion of water across a selectively permeable membrane |
front 3 Water diffuses across a from the region of? | back 3 Lower solute to higher solute, until it is equal on both sides. |
front 4 What is the ability of a surrounding solution to cause a cell to gain or lose water? | back 4 Tonicity |
front 5 * Solute concentration is the same as that inside the cell no net water movement across the plasma membrane * | back 5 Isotonic solution |
front 6 Solute concentration is Greater than that inside the cell; cell loses water | back 6 Hypertonic solution (shriveling) |
front 7 Solute concentration is Less then that inside of the cell; cell gains water. | back 7 Hypotonic solution (burst) |
front 8 What creates problems for organisms? | back 8 hypotonic and hypertonic environments |
front 9 The control of solute concentrations and water balance is a necessary adaption for life in such environments. | back 9 Osmoregulation |
front 10 What has a contractile vacuole that acts as a pump? | back 10 The protest paramecium, which is hypertonic, to its pond water |
front 11 Cell walls help maintain what? | back 11 water balance |
front 12 A plant cell in a hypotonic solution swells until the wall opposes uptake; the cell is now what? | back 12 Turgid (firm) |
front 13 If a plant cells surroundings are isotonic, then? | back 13 There is no net movement of qater into the cell; the cell becomes flaccid (limp) and the plant may wilt |
front 14 In a hypertonic environment, plant cells lose water, eventually? | back 14 The membrane pulls away form the wall |
front 15 This is a lethal effect called | back 15 Plasmolysis |