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3.3a Cell Division
Cells
| Question | Answer |
|---|---|
| The Cell Cycle | Monitored by checkpoints before passing to the next phase |
| Apoptosis | programmed cell death |
| G1 | occupies most of the cell's life, 90%; carries out routine functions; cell growth; |
| S phase | replication of DNA |
| G2 | other organelles replicate and cell prepares for cell division; chromatin (uncoiled DNA) begins to tighten and coil into chromosomes |
| Prophase | Chromosomes are present; nuclear envelope breaks down; centrioles migrate to polar ends, and mitotic spindle forms |
| Metaphase | chromosomes line up along the middle of the cell, mitotic spindle attaches to the centeromere of each chromosome |
| Anaphase | mitotic spindles shorten, drawing sister chromatids apart |
| Telephase | Nuclear envelope begins to reform and cytokinesis begins |
| Cytokinesis | division of the cytoplasm |
| cleavage furrow | seen by narrowing of the cell membrane pinching inward |
| Transcription | DNA to RNA |
| Translation | RNA to "amino acid" protein |
| centromere | the area of DNA chromosomes where sister chromatids join; the middle of the X of replicated chromosomes |
| chromatin | Uncoiled chromosomes/DNA |
| Sister chromatids | 2 identical sides of DNA in a chromosome; joined by the centromere |