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 |
---|---|---|---|
54135 | 2020-10-03 03:47:07 | 73.54 | 97% |
42620 | 2019-07-31 04:36:11 | 74.25 | 97% |
35300 | 2019-01-08 00:44:38 | 69.24 | 97% |
33998 | 2018-12-29 11:23:51 | 101.29 | 98% |
29081 | 2018-12-14 14:18:36 | 100.72 | 98% |