| A | B |
|---|
| concentration gradient | the graduated difference in concentration of a solute per unit distance through a solution |
| diffusion | the movement of particles from an area of high concentration to an area of low concentration; a natural result of kinetic molecule energy |
| endocytosis | a process in which a cell engulfs extracellular material through an inward folding of its plasma membrane |
| exocytosis | a process in which a cell releases substances to the extracellular environment by fusing a vesicular membrane with the plasma membrane, separating the membrane at the point of fusion and allowing the substance to be released |
| facilitated diffusion | a process in which substances are transported across a plasma membrane with the concentration gradient with the aid of carrier (transport) proteins; does not require the use of energy |
| lipids | a group of organic compounds composed mostly of carbon and hydrogen including a proportionately smaller amount of oxygen; are insoluble in water, serve as a source of stored energy, and are a component of cell membrane |
| Golgi apparatus | an organelle found in eukaryotic cells responsible for the final stages of processing proteins for release by the cell |
| organelle | a subunit within a cell that has a specialized function |
| tissue | a unit composed of cells organized to perform a similar function |
| proteins | a macromolecule that contains the principal components of organisms: C, H, O and N ; performs a variety of structural and regulatory functions for cells |
