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 |
---|---|---|---|
7691 | 2019-02-28 13:49:12 | 89.22 | 99% |
3403 | 2018-05-16 10:31:38 | 84.48 | 98% |
1994 | 2018-03-03 13:47:59 | 81.90 | 98% |
1419 | 2018-02-06 02:16:35 | 81.82 | 99% |