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 |
---|---|---|---|
12351 | 2018-07-26 15:02:36 | 122.41 | 100% |
9567 | 2017-11-19 19:22:40 | 112.38 | 98% |
7575 | 2017-11-01 15:58:05 | 106.97 | 97% |
6388 | 2017-10-26 22:23:58 | 104.96 | 98% |
3132 | 2017-10-12 18:58:33 | 104.96 | 98% |