| Term | Definition |
| cell theory | States that all organisms are made up of one or more cells,the cell is the basic unit of life,and all cells come from other cells |
| Cell wall | Rigid structure that enclosed, supports, and protects the cells of plants, algae, fungi,and most bacteria |
| Cell membrane | Protective outer covering of all cells that regulates the interaction between the cell and the environment |
| Cytoplasm | Constantly moving gelatinlike mixture inside the cell membrane that contains heredity material and is the location of most of a cell's life processes |
| ribosome | Small structure on which cells make their own proteins |
| Organelle | Structure in the cytoplasm of eukaryotic cell that can act as a storage site, process energy, move materials, or manufacture substances |
| Nucleus | Organelle that controls all the actives of a cell and contains hereditarily material made of DNA |
| Chloroplast | Green, chlorophyll-containing, plant-cell organelle that captures light energy, which is used to make sugar |
| Mitochondrion | Cell organelle where food is broken down, which releases energy. |
| Endoplasmic reticulum | Cytoplasmic organelle that moves materials around in a cell |
| Golgi body | Organelles that sort and package cellular materials and transport them within the cell or out of the cell. |
| Tissue | Group of similar cells that work together to do one job. |
| Organ | Structure,such as the heart,made up of different types of tissues that all work together |
| Organ system | A group of organs working together to perform a certain function. |
