| Question |
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| Answer |
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| 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
