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 |
---|---|---|---|
53487 | 2020-07-07 10:19:07 | 113.91 | 98% |
44577 | 2020-05-23 11:18:42 | 121.16 | 98% |
41834 | 2020-05-10 09:33:32 | 113.56 | 97% |
40089 | 2020-05-02 05:03:01 | 106.86 | 97% |
35424 | 2020-04-04 06:40:48 | 111.68 | 98% |
20287 | 2019-11-03 07:55:00 | 106.46 | 97% |
16455 | 2019-09-13 03:20:36 | 97.99 | 97% |
11152 | 2019-06-29 13:02:45 | 112.27 | 98% |