| A | B |
|---|
| multicellular organism | An organism that contains more than one cell. |
| receptor proteins | Proteins found embedded in the cell membrane that send signals to the inside of the cell. |
| diffusion | Movement of a substance from a region of high concentration to a region of lower concentration, uses kinetic energy of the molecules. |
| osmosis | Diffusion of water. |
| selective transport | movement of specific molecules by means of protein channels and pumps. |
| facillitated diffusion | A Form of selective transport that can only move molecules from high to low concentration. |
| active transport | movement of molecules that require ATP molecules can be concentrated against the gradient. |
| endocytosis | Process of the cell engulfing large particles to bring them inside the cell. |
| exocystosis | wastes or secretions expelled form the cell using small sacs. |
| metabolism | chemical reactions that occur in a cell. |
| activation energy | Energy required to start a reaction. |
| enzyme | Protein that controls chemical reactions in a cell. |
| catalyst | A compound that lowers the activation energy for a chemical reaction. |
| substrate | A molecule that an enzyme changes. |
| active site | The region on an enzyme that the substrate binds. |
| ATP | The energy molecule of the cell that is used for metabolism. |
| cellular respiration | The process of taking apart molecules and transferring the energy to ATP. |
| glycolysis | The first step in cellular respiration. |
| oxidation respiration | The process that requires oxygen to finish vreaking a glucose molecule down and transferring the energy to ATP. |
| pyruvic acid | The end product of glycolysis. |
| fermentation | The process of converting pyruvic acid to alcohol and carbon dioxide. |
| feedback inhibition | Slowing or stopping a reaction to control metabolism. |
