| Question |
Answer |
| active transport | process requiring energy by which cells move materials against a concentration gradient |
| contractile vacuole | organelle that some protists such as paramecium possess that collects and expels water |
| diffusion | net,random movement of particles from an area of high concentration to an area of low concentration |
| dynamic equilibrium | condition of continuous movemnet of particles across a gradient with no overall change in concentration |
| endocytosis | active transport of particles into a cell |
| exocytosis | active transport of particles out of a cell |
| facilitated diffusion | passive transport of particles such a sugars and amino acids across a membrane by way of transport proteins |
| fluid mosaic model | property of the plasma membrane wherein many similiar molecules are free to move sideways within their lipid bilayer |
| hypertonic solution | in cells the condition where the solution outside the cell is more concentrated than inside the cell-causes cells to shrink |
| hypotonic solution | in cells the condition where the solution outside the cell is less concentrated than inside the cell causing the cell to swell and possibly explode |
| isotonic solution | in cells the condition where the solution outside the cells is the same concentration as inside the cell |
| osmosis | the diffusion of water through a membrane depending on the concentration of solutes on either side of the membrane. |
| passive transport | in cells the movement of particles across a membrane requiring no expenditure of energy.ex-diffusion and osmosis |
| phospholipid | membrane lipids having phosphate groups attached to them.Plasma membranes of cells are made of these. |
| plasmolysis | process resulting in a drop in turgor pressure-ie. plants wilting |
| selective permeability | property of the plasma membrane where it controls what enters and exits the cell. |
| transport protein | a protein embedded in the cell membrane that can allow molecules to pass back and forth across the membrane |
| turgor pressure | internal pressure within a cell caused by water in the central vacuole |
mr. charles11
