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 |
---|---|---|---|
17781 | 2018-06-26 21:00:45 | 88.15 | 97% |
16661 | 2018-05-14 21:43:13 | 92.04 | 97% |
11494 | 2018-01-12 18:58:59 | 95.50 | 98% |
11197 | 2018-01-08 18:49:12 | 88.51 | 97% |
11162 | 2018-01-06 16:50:23 | 98.52 | 98% |