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.
676 total characters in this text.
View Pit Stop page for this text
| Rank | Username | WPM | Accuracy | Date |
|---|---|---|---|---|
| 1467. | Noximini (noximini) | 72.30 | 96% | 2019-10-01 |
| 1468. | G (zger) | 72.28 | 95% | 2020-01-29 |
| 1469. | Alex (sidewalkshowdown) | 72.27 | 97% | 2018-12-12 |
| 1470. | Rahul (russellriago) | 72.27 | 97% | 2020-02-28 |
| 1471. | Roar (rorsyl) | 72.26 | 96% | 2019-01-29 |
| 1472. | Arnas (dandelionas) | 72.25 | 97% | 2018-10-01 |
| 1473. | Nick (kmkhami) | 72.22 | 96% | 2018-11-14 |
| 1474. | jessica (jessicawang01) | 72.21 | 97% | 2018-06-17 |
| 1475. | Anthony (smychavo) | 72.17 | 96% | 2020-06-13 |
| 1476. | lonewolf (ilonewolfi) | 72.15 | 96% | 2017-11-27 |
| 1477. | Cosmic (cosmicuser) | 72.15 | 96% | 2020-09-05 |
| 1478. | Mason (edwardmason) | 72.13 | 95% | 2017-11-29 |
| 1479. | Kyle (howdydoodat) | 72.05 | 96% | 2018-07-16 |
| 1480. | Sardar Taha (dice111) | 72.02 | 95% | 2018-02-18 |
| 1481. | Adarsha (adarshap) | 72.02 | 96% | 2019-06-01 |
| 1482. | J (fortunapls) | 72.01 | 99% | 2018-09-28 |
| 1483. | sailend (sailend) | 71.99 | 95% | 2018-02-12 |
| 1484. | omar (33freezing) | 71.97 | 98% | 2020-11-25 |
| 1485. | nishinoodles (xjoshh35) | 71.96 | 95% | 2019-06-25 |
| 1486. | llarin (krypton1an) | 71.96 | 97% | 2020-08-13 |
| 1487. | Tom (tombertoli) | 71.96 | 94% | 2020-02-29 |
| 1488. | Joy (joyyang810035) | 71.95 | 96% | 2020-10-01 |
| 1489. | Akrish (akrish) | 71.92 | 96% | 2019-08-12 |
| 1490. | Autumn (act01) | 71.91 | 96% | 2020-11-06 |
| 1491. | George (turtlerocker) | 71.90 | 99% | 2019-01-25 |
| 1492. | Daniel (doctorfm3) | 71.89 | 93% | 2019-08-16 |
| 1493. | shui (sammi76) | 71.88 | 97% | 2017-11-16 |
| 1494. | Twoja (frosty666) | 71.87 | 95% | 2017-10-16 |
| 1495. | Edebus (edebus) | 71.87 | 96% | 2019-01-06 |
| 1496. | Kombucha (k0mbucha) | 71.85 | 96% | 2020-02-06 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | 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 |