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 |
---|---|---|---|
46771 | 2020-12-17 09:44:14 | 70.83 | 96% |
42607 | 2020-11-02 15:09:46 | 81.33 | 97% |
32073 | 2020-04-15 13:31:51 | 78.52 | 98% |
26052 | 2020-01-04 05:59:09 | 74.59 | 97% |
17787 | 2019-09-15 11:13:42 | 73.78 | 97% |
15457 | 2019-06-17 13:13:41 | 72.06 | 96% |
6959 | 2019-03-03 16:55:22 | 63.22 | 97% |