| Question |
Answer |
| passive transport | when substances cross the membrane without the use of energy |
| diffusion | movement of molecules from an area of higher concentration to an area of lower concentration |
| concentration gradient | the difference in amounts of substances on either side of a membrane-usually one side has more than the other |
| equilibrium | When the concentration of substances are equal on both sides of a membrane |
| plasmolysis | lack of water in a plant. It wilts |
| cytolysis | the bursting of red blood cells when placed in a hyotonic solution |
| facilitated diffusion | aided by special proteins imbedded in the membrane molecules cross without energy |
| carrier protein | in the membrane, this helps molecules travel across the membrane without using energy |
| ion channel | small passageways in the membrane that allow Na+ or Cl- to pass through |
| osmosis | when water moves from one side of a membrane to another-moving from higher to lower concentration |
| hypotonic | when the solution outside a cell is less concentrated than inside the cell |
| hypertonic | when the solution outside a cell is more concentrated than inside the cell |
| isotonic | when a solution outside a cell is the same concentration as inside the cell |
| contractile vacuole | organelle that removes water for some organisms like paramecium |
| turgor pressure | the pressure that water exerts on the cell walls and central vacuoles of plants. |
Ch.18 LTI-MA 509
