 | Term | Definition |
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Why are Cells Small?? |
the larger a cell grows, the more demands the cell places on its DNA; in addition, the cell has more trouble moving enough nutrients & wastes across the cell membrane |
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Events of Cell Cycle |
G1 phase, S phase, G2 phase, M phase |
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Mitosis (4 stages) |
Prophase, Metaphase, Anaphase, & Telophase |
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Prophase |
chromatin condenses into chromosomes; centrioles seperate and a spindle begins to form; the nuclear envelope breaks down |
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Metaphase |
chromosomes line up across the center of the cell; each chromosome is connected to a spindle fiber at its centromere |
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Anaphase |
the sister chromatids seperate into individual chromosomes and are moved apart |
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Telophase |
the chromosomes gather at opposite ends of the cell and lose their distinct shapes; 2 new nuclear envelopes will form |
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Cytokinesis |
the division of the cytoplasm |
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Chromosomes |
threadlike structures within the nucleus containing the genetic info that is passed from one generation of cells to the next |
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Chromatid |
1 of 2 identical "sister" parts of a duplicated chromosome |
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p53 |
involved in cancer cells; normally halts the cell cycle until all chromosomes have been properly replicated; damaged or defective p53 genes cause the cells to lose the info needed to respnd to signals that would normally control their growth |
