| Term | Definition |
| mitosis | process of nuclear duplication and division |
| anaphase | chromosomes pulled to opposite sides of the cell |
| cytokinesis | cell actually divides |
| metaphase | chromosomes line up in the middle of the nucleus |
| interphase | phase in which the cell spends most of its time |
| telophase | two nuclei begin to form |
| prophase | DNA thinkens, nucleus prepares to go through division |
| cell cycle | the entire life of a cell |
| size, growth, repair | reasons cells divide |
| cyclin | protein that regulates the cell cycle |
| spindle | the structure that pulls the chromatids apart and to opposite ends of the cell |
| internal regulator | controls the cell cycle from the inside |
| external regulator | crontrol the cell cycle from the outside. |