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 |
---|---|---|---|
22507 | 2019-06-26 04:34:56 | 81.44 | 98% |
20688 | 2019-05-22 03:49:14 | 79.99 | 97% |
20239 | 2019-05-14 03:24:08 | 78.66 | 97% |
3746 | 2018-02-18 05:34:17 | 64.60 | 96% |