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 |
---|---|---|---|---|
1441. | everyone's favorite (everyo... | 72.53 | 95% | 2020-05-26 |
1442. | Donzelle (donnie12) | 72.50 | 96% | 2020-09-29 |
1443. | Axee (axri) | 72.48 | 96% | 2020-10-13 |
1444. | Neil (xdestroyer2x) | 72.47 | 98% | 2020-02-02 |
1445. | João (gomendrown) | 72.46 | 95% | 2017-11-28 |
1446. | Phan (hed_wig) | 72.41 | 95% | 2020-03-13 |
1447. | Auyox (deadbags) | 72.39 | 95% | 2020-05-10 |
1448. | changorilla (changorilla) | 72.37 | 98% | 2018-01-11 |
1449. | Jacek (axee) | 72.37 | 98% | 2018-03-17 |
1450. | Holly (runningnurse) | 72.37 | 98% | 2018-01-05 |
1451. | GNU先輩 (gnuman98) | 72.35 | 98% | 2019-02-08 |
1452. | alex (humble_diligent) | 72.35 | 97% | 2019-10-07 |
1453. | Macy (macy200200) | 72.34 | 95% | 2019-05-03 |
1454. | matt (matterz5) | 72.33 | 96% | 2020-11-16 |
1455. | Noximini (noximini) | 72.30 | 96% | 2019-10-01 |
1456. | G (zger) | 72.28 | 95% | 2020-01-29 |
1457. | Rahul (russellriago) | 72.27 | 97% | 2020-02-28 |
1458. | Alex (sidewalkshowdown) | 72.27 | 97% | 2018-12-12 |
1459. | Roar (rorsyl) | 72.26 | 96% | 2019-01-29 |
1460. | Arnas (dandelionas) | 72.25 | 97% | 2018-10-01 |
1461. | Nick (kmkhami) | 72.22 | 96% | 2018-11-14 |
1462. | jessica (jessicawang01) | 72.21 | 97% | 2018-06-17 |
1463. | Anthony (smychavo) | 72.17 | 96% | 2020-06-13 |
1464. | Cosmic (cosmicuser) | 72.15 | 96% | 2020-09-05 |
1465. | lonewolf (ilonewolfi) | 72.15 | 96% | 2017-11-27 |
1466. | Mason (edwardmason) | 72.13 | 95% | 2017-11-29 |
1467. | Kyle (howdydoodat) | 72.05 | 96% | 2018-07-16 |
1468. | Adarsha (adarshap) | 72.02 | 96% | 2019-06-01 |
1469. | Sardar Taha (dice111) | 72.02 | 95% | 2018-02-18 |
1470. | J (fortunapls) | 72.01 | 99% | 2018-09-28 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
New English Texts | 1 | 108.31 | May 26, 2022 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |