| A | B |
| Colonial Organism | Group of cells that are permanently associated but do not communicate with one another |
| Cell Membrane | Layer that forms the boundary between the inside and outside of a cell |
| Cytoplasm | Fluid in a cell and almost all the structures suspended in the fluid |
| Ribosome | Cell structue on which protiens are made |
| Endoplasmic Reticlum | System of membranes that helps move substances through a cell |
| Tissue | Distinct group of cells with a similar structure and function |
| Organ | Tissues organized into a specialized structure with a specific function |
| Organ System | Collection of organs that carry out a major body function |
| Prokaryote | Organism that has no nucleus and lacks a variety of organelles |
| Eukaryote | Organism made up of cells that have a nucleus and membrane-bound arganelles |
| Nucleus | Organelle that contains the DNA of a eukaryotic cell |
| Organelle | Cell structure that carries out a specific, specialized function in a eukaryotic cell |
| Vesicle | Small sac that contains materials |
| Vacuole | Sac filled fluid in a plant cell |
| Golgi apparatus | Organelle that helps package materials to be sent out of the cell |
| Mitochandria | Organelle that uses energy from organic compounds to make ATP |
| Chloroplast | Organelle that uses light energy to make sugar from carbon dioxide and water |
| Flagellum | Long, threadlike structure that rotates |