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.
—from Campbell Biology AP Edition, a book by Campbell
Active since October 7, 2017.
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Rank | Username | WPM | Accuracy | Date |
---|---|---|---|---|
1752. | Jyothiraditya (jyothiraditya) | 64.40 | 94% | 2018-05-21 |
1753. | KirinChibi (k4nna) | 64.38 | 96% | 2019-03-08 |
1754. | Hydratictheta (flobosthefish) | 64.34 | 95% | 2020-10-25 |
1755. | skj (sanatskj) | 64.34 | 95% | 2018-07-02 |
1756. | txbklyn (txbklyn) | 64.24 | 98% | 2017-11-28 |
1757. | vbop (vbop) | 64.14 | 95% | 2018-12-10 |
1758. | Gerhard (gkuschnik) | 64.12 | 96% | 2018-11-27 |
1759. | pinkpigeon (pinkpigeon) | 64.12 | 96% | 2020-10-12 |
1760. | Rahul (jakatir) | 63.97 | 96% | 2020-04-10 |
1761. | 최승진 (fatherless) | 63.96 | 96% | 2020-07-31 |
1762. | jacob (nalyly) | 63.89 | 96% | 2019-03-31 |
1763. | K (rhiz0matix) | 63.89 | 97% | 2020-04-20 |
1764. | Josh (syztyqus) | 63.87 | 96% | 2020-11-14 |
1765. | Sure (ichiraifu) | 63.87 | 96% | 2020-11-28 |
1766. | nani (typingfever) | 63.83 | 93% | 2020-04-12 |
1767. | Francisco (distribui) | 63.82 | 97% | 2019-02-14 |
1768. | Alex (grim_polar_fox) | 63.81 | 96% | 2017-10-14 |
1769. | Mohammed (mohammedamarnah) | 63.79 | 95% | 2018-08-29 |
1770. | dude (udead1) | 63.71 | 97% | 2020-02-01 |
1771. | Viet (vietbui99) | 63.67 | 95% | 2018-08-10 |
1772. | July (phi4069) | 63.63 | 96% | 2020-03-26 |
1773. | Simon (siggyyo) | 63.61 | 95% | 2019-06-18 |
1774. | Amber (amadams) | 63.61 | 96% | 2019-09-19 |
1775. | murdr (murdrkeys) | 63.60 | 95% | 2020-06-08 |
1776. | HeLLoki (loki_2606) | 63.59 | 97% | 2019-07-13 |
1777. | Eric (qwarts) | 63.58 | 94% | 2020-08-10 |
1778. | Galatia (xisnyang) | 63.50 | 93% | 2019-12-08 |
1779. | Vebjørn (vebzebol) | 63.47 | 95% | 2018-06-07 |
1780. | Hoang (mimamimo) | 63.44 | 96% | 2018-06-22 |
1781. | Friedrich (drmomake) | 63.34 | 97% | 2018-08-16 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
New English Texts | 1 | 108.31 | May 26, 2022 |