| Term | Definition |
| catabolic reachtions | chemical bonds are being broken |
| exergonic | energy is being released as the chemical bonds are being broken |
| anabolic reactions | chemical bonds are being formed and molecules are being synthesized |
| endergonic | require the input of energy |
| ATP (Adenosine Triphosphate) | molecule that provides most of the energy for a cell |
| ADP + P+ energy | the result of breaking an ATP molecule |
| cell membrane/plasma membrane | a phospholipid bilayer that surrounds the cell |
| membrane proteins | contained within the cell membrane; act as receptors sensitive to external stimuli; act as channels that regulate the movement of substances in and out of the cell |
| cytoplasm | the gem inside of the cell membrane that contains proteins, electrolytes, and various other molecules and organelles |
| nucleus | contains most of the DNA of a cell |
| rough endoplasmic reticulum | complex series of interconnectred membrane sacks that function to build and process proteins |
| golgi complex | a series of membrane sacks that further process and package proteins after they leave the rough endoplasmic reticulum |
| mitochondria | organelles that produce most of the ATP used by cells |
| smooth endoplasmic reticulum | complex network of membrane sacks that stores calcium used to trigger contraction or store enzymes used to detoxify the cell or help produce hormones and other coomplex molecules |