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 |
---|---|---|---|
19331 | 2020-09-12 15:00:52 | 75.73 | 94% |
10498 | 2019-08-15 14:35:53 | 69.58 | 92% |
8552 | 2019-06-28 22:21:19 | 68.27 | 93% |
6595 | 2019-05-03 17:52:25 | 66.66 | 94% |