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 |
---|---|---|---|---|
1562. | Chitraketu (alpha1321) | 69.96 | 97% | 2020-03-20 |
1563. | Marcus (asdfmango) | 69.96 | 95% | 2018-05-05 |
1564. | Jeffrey (jeffrey7212) | 69.96 | 95% | 2019-05-08 |
1565. | Zach (encasedthought) | 69.95 | 96% | 2017-10-09 |
1566. | Gabriel (gblue1102) | 69.94 | 97% | 2017-10-27 |
1567. | JJ (jjbonta) | 69.94 | 96% | 2017-11-29 |
1568. | Dylan (dzeddy) | 69.90 | 96% | 2019-04-25 |
1569. | Sammy (sammyaxel) | 69.86 | 96% | 2020-07-16 |
1570. | Pedro (pedro5370) | 69.81 | 97% | 2019-11-29 |
1571. | krabbos (krabbos) | 69.81 | 97% | 2018-06-26 |
1572. | HotDogRacer69 (eager69) | 69.78 | 97% | 2019-08-08 |
1573. | Marcin (marzelin) | 69.74 | 98% | 2018-12-24 |
1574. | Ed (raptorofli) | 69.72 | 95% | 2020-11-19 |
1575. | teresa (teresamarie) | 69.69 | 97% | 2019-08-02 |
1576. | No (bambusnippel) | 69.69 | 96% | 2018-04-21 |
1577. | QuietObedientConsent (arrow... | 69.68 | 96% | 2018-11-25 |
1578. | Antoni (aachh) | 69.66 | 96% | 2019-09-24 |
1579. | Lewis (dantan) | 69.61 | 97% | 2018-12-20 |
1580. | Spencer (spencertyper) | 69.61 | 96% | 2019-06-17 |
1581. | Wot (ostricheleven) | 69.56 | 96% | 2020-02-02 |
1582. | J (sadiputs) | 69.56 | 96% | 2019-03-16 |
1583. | Evan (lil_effer) | 69.53 | 97% | 2018-03-07 |
1584. | Mikha (mikhartani) | 69.53 | 98% | 2018-08-29 |
1585. | Will (shneme01) | 69.51 | 94% | 2019-12-12 |
1586. | z (qatarking24) | 69.49 | 94% | 2020-12-01 |
1587. | ddp (ddpham) | 69.47 | 95% | 2019-04-08 |
1588. | cmath (chrismath) | 69.46 | 97% | 2020-12-18 |
1589. | Muhammad (muhenka) | 69.46 | 97% | 2019-09-05 |
1590. | Sean (seanmeister) | 69.42 | 95% | 2018-04-21 |
1591. | aaron (naruto2141) | 69.41 | 94% | 2020-07-22 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,909 | 89.29 | 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 |