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 |
---|---|---|---|
56277 | 2020-03-22 18:50:16 | 112.21 | 98% |
47783 | 2019-07-01 00:39:17 | 117.64 | 99% |
40489 | 2018-08-27 23:28:40 | 104.81 | 98% |
40034 | 2018-08-15 23:14:42 | 96.03 | 97% |