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 |
---|---|---|---|
25282 | 2020-11-18 21:38:11 | 103.78 | 97% |
14758 | 2020-06-29 04:56:30 | 97.55 | 97% |
10526 | 2020-03-11 00:43:42 | 89.88 | 97% |
9948 | 2020-02-29 02:03:58 | 85.39 | 96% |