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 |
---|---|---|---|---|
1411. | reysette (reysettemart) | 73.19 | 96% | 2020-08-07 |
1412. | Corey (oldmanbrink) | 73.17 | 96% | 2019-04-26 |
1413. | Ahead of you (wadehuangjr) | 73.16 | 97% | 2020-09-29 |
1414. | Jimmy (whiteice) | 73.15 | 95% | 2020-01-01 |
1415. | Ronak (rdatta456) | 73.13 | 96% | 2019-07-01 |
1416. | Mark (figzes) | 73.04 | 95% | 2019-08-18 |
1417. | Hah (verdaderopan) | 72.99 | 97% | 2019-07-26 |
1418. | Chetan (ch374n) | 72.95 | 96% | 2019-08-27 |
1419. | LimeAle (tofuloaf) | 72.94 | 95% | 2018-12-27 |
1420. | Raj2631 (raj2631) | 72.92 | 96% | 2020-05-19 |
1421. | James (wnston) | 72.88 | 95% | 2020-06-07 |
1422. | Atticus (plutakis) | 72.87 | 95% | 2018-06-20 |
1423. | Rodney (rodneyslafuente) | 72.84 | 96% | 2020-11-16 |
1424. | Giorgi (0_alien) | 72.84 | 96% | 2017-11-16 |
1425. | twitch.tv/darkmatterv4 (blo... | 72.83 | 94% | 2020-07-14 |
1426. | erk (estalow) | 72.83 | 95% | 2019-05-07 |
1427. | Neko (pippaola) | 72.82 | 97% | 2017-10-11 |
1428. | 144p 1998 VW Beetle (stryke... | 72.82 | 97% | 2018-12-12 |
1429. | Graham (graham152) | 72.82 | 97% | 2019-09-24 |
1430. | Durum (durumpitta) | 72.78 | 98% | 2018-03-29 |
1431. | Crashie (exploiter911) | 72.76 | 95% | 2018-09-16 |
1432. | Tizzzay (tizthewizard) | 72.74 | 95% | 2018-12-07 |
1433. | kyupii (kyupii) | 72.73 | 95% | 2020-05-21 |
1434. | yayeet (repmal) | 72.66 | 95% | 2018-11-10 |
1435. | ICKOStreet (ickostreet) | 72.66 | 94% | 2020-05-15 |
1436. | Fredrik (falcanen) | 72.61 | 98% | 2017-12-17 |
1437. | Bob (bobdebuilder) | 72.61 | 97% | 2018-05-03 |
1438. | Connor (c42855) | 72.59 | 98% | 2018-07-04 |
1439. | Evan (chubbehmouse) | 72.56 | 96% | 2018-02-18 |
1440. | Kenneth (pseudoscience) | 72.55 | 95% | 2019-06-11 |
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 |