| Term | Definition |
| active transport | transport of a substance (as a protein or drug) across a cell membrane against the concentration gradient |
| cell | baisic units of structure and function in all living things |
| metabolism | the combination of all the chemical reactions that occur in an organism |
| hemeostasis | the maintenance of internal stability |
| reproduction | the passing of hereditary information to new organisms of the same type |
| cell respiration | breaking nutrients into smaller units to release the chemical energy stored in them |
| synthesis | combining simple substances into complex substances |
| inorganic | molecules that dont contain both carbon and hydrogen |
| organic | contains both carbon and hydrogen |
| organelles | specialized structures in cells |
| tissues | groups of specialized cells bonded to perform one common function |
| organ | different tissues that are combined to perform one common function |
| organ system | several organs grouped to perform one common function |
| cytoplasm | jelly like substance inside the cell which contains speicalized structures |
| nucleus | the control center of the cell |
| vacuoles | storage sacs within the cytoplasm |
| ribosomes | structures important to the process of making proteins |
| mitochondria | pod shaped sturctures that contain special proteins known as enzymes |
| enzymes | used to extract energy from nutrients |
| chloroplasts | contains green pigment chlorophyll and capture light energy |
| cell membrane | thin sturcture that surrounds the cell |
| diffusion | the movement of moleucles from areas of high concentration to areas of low concentration |
| digestion | when large molecules are broken down into simpler molecues |
| amino acids | smaller molecules from broken down proteins |
| simple sugars | smaller molecules of broken down starches |
| receptor molecules | protein molecules that can recieve chemical messages from other cells |