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 |
---|---|---|---|
18369 | 2020-10-29 01:58:29 | 104.40 | 97% |
17175 | 2020-10-14 03:53:33 | 105.39 | 98% |
12166 | 2020-08-06 20:19:56 | 107.29 | 99% |
7555 | 2020-01-12 21:04:52 | 95.90 | 97% |