| A | B |
|---|
| lipid bilayer | tough, flexible barrier made up of a double-layerd pattern of phospholipids |
| cell membrane | cell structure that separates and protects the cell from its surroudings |
| cell wall | cell component of plants, algae, and bacteria that is made of carbohydrates and protein |
| passive transport | process that occurs when substances cross the cell membrane automatically, without the cell expending any energy |
| diffusion | when substances spread randomly from regions of high concentration to lower concentration |
| osmosis | diffusion of water through a selectively permeable membrane |
| active transport | movement of a substance against a concentration gradient |
| plasmolysis | osmosis when water leaves the cell because the concentration of water inside the cell is greater than outside the cell |
| hydrophobic | water fearing |
| hydrophilic | water loving |
| polar | charged end |
| facilitated diffusion | use of proteins to move particles from greater concentrations to lesser concetration |
| hypertonic | more concentrated |
| hypotonic | less concentrated |
| passive | requires no energy |
| active | requires energy |
| exocytosis | leaving the cell |
| endocytosis | entering or inside the cell |
