| A | B |
|---|
| active transport | carrier-mediated process uses cellular energy to move a substance against a concentration gradient |
| concentration gradient | a measurable difference in concentration from one area to another |
| diffusion | tendency of small particles to spread out evenly within any given space |
| endocytosis | plasma membrane "traps" extracellular material and brings it into the cell |
| enzyme | type of protein molecule that acts as a chemical catalyst, reducing the activation energy needed for a chemical reaction and thus increasing the likelihood of the reaction starting |
| meiosis | nuclear division that reduces the number of chromososmes in half |
| metabolism | set of chemical reactions in living organisms |
| mitosis | cell division involving complex changes in the nucleus |
| osmosis | diffusion of water through a selctively permeable membrane |
