| Term | Definition |
| Autotrophic Organisms | Organisms such as green plants which convert sunlight into bond energy |
| Bond Energy | A type of energy that comes from the sun and is stored in the bonds of organic compounds |
| Photosynthesis | The process which organisms use to convert sunlight into bond energy |
| Heterotrophic Organisms | Organisms that obtain their energy catabolically via the breakdown of organic nutrients that must be ingested |
| Anabolic Reactions | Reactions that are energy-requiring, involving biosynthesis of complex organic compounds from simpler molecules |
| Catabolic Reactions | Reactions that release energy as they break down complex organic compounds into smaller molecules |
| Cellular Metabolism | The sum total of all chemical reactions that take place in a cell |
| Glucose | C6H12O6 |
| Adenosine Triphosphate | The cell's main energy currency |