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 |
---|---|---|---|
19846 | 2020-10-25 10:24:28 | 150.60 | 98% |
14598 | 2020-05-17 23:14:00 | 146.01 | 97% |
11948 | 2020-03-22 23:27:22 | 149.22 | 98% |
4823 | 2018-09-21 06:34:33 | 136.75 | 98% |