| Term | Definition |
| Cell Membrane | the outer layer of the cell that acts as a boundary layer to contain the cytoplasm (fluid in cell) |
| Vacuole | a membrane enclosing fluid in a sack within a cell, often containing a watery liquid or secretion. |
| Nucleus | the central part of the cell containing DNA and RNA and responsible for growth and reproduction - contains the nucleolus, chromatin, and nucleoplasm |
| Nuclear Envelope | the double membrane surrounding the nucleus within a cell |
| Chromatin | The substance of a cell nucleus, consisting of strands of DNA, RNA, and various proteins, that forms chromosomes during cell division. |
| Nucleolus | A small, round granular body composed of protein and RNA in the nucleus of a cell |
| Nuclear Pore | Perforations in a nuclear membrane which allow materials to flow in and out of the nucleus |
| Cytoplasm | the cell substance between the cell membrane and the nucleus |