Mitochondria and chloroplasts display similarities with bacteria that led to the endosymbiont theory. This theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using non-photosynthetic prokaryotic cell. Eventually, the engulfed cell formed a relationship with the host cell in which it was enclosed, becoming an endosymbiont, a cell living within another cell. Indeed, over the course of evolution, the host cell and its endosymbiont merged into a single organism, a eukaryotic cell with a mitochondrion. At least one of these cells may have then taken up a photosynthetic prokaryote, becoming the ancestor of eukaryotic cells that contain chloroplasts.
Game | Time | WPM | Accuracy |
---|---|---|---|
25187 | 2023-03-27 03:04:20 | 211.64 | 100% |
6979 | 2020-10-28 17:20:22 | 178.46 | 99% |
3947 | 2020-09-02 00:35:13 | 123.10 | 96% |
3812 | 2020-08-30 18:38:43 | 135.88 | 97% |
1524 | 2020-07-26 20:35:01 | 144.16 | 98% |