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 |
|---|---|---|---|---|
| 1555. | Zoot (chroniaro) | 70.65 | 96% | 2019-04-29 |
| 1556. | BAKES (mattattack1223) | 70.64 | 95% | 2018-11-01 |
| 1557. | Che (che247) | 70.64 | 96% | 2020-05-06 |
| 1558. | Kyozō (thegiantchip) | 70.61 | 95% | 2019-07-17 |
| 1559. | ng (minhtuhay123) | 70.56 | 97% | 2020-08-05 |
| 1560. | you (michellechihoatang) | 70.55 | 95% | 2020-05-12 |
| 1561. | Shoaib Sajid (shoaibsajid) | 70.50 | 97% | 2018-08-17 |
| 1562. | Ronald (ron777) | 70.50 | 96% | 2018-12-26 |
| 1563. | David (dazzlethc) | 70.50 | 97% | 2020-03-07 |
| 1564. | Dmeister (dclott) | 70.50 | 97% | 2019-11-23 |
| 1565. | sweetyukibo (sweetyukibo) | 70.47 | 97% | 2018-02-02 |
| 1566. | Beddytear (beddytear) | 70.46 | 96% | 2020-11-19 |
| 1567. | Ray (ray_maddox) | 70.45 | 95% | 2020-05-19 |
| 1568. | LEntless (lentless) | 70.42 | 97% | 2017-10-07 |
| 1569. | Troels (duckzern) | 70.42 | 96% | 2019-09-09 |
| 1570. | teetoHappy (teetohappy) | 70.37 | 95% | 2020-12-18 |
| 1571. | The (pseudotypist) | 70.35 | 96% | 2020-11-11 |
| 1572. | Jennifer (jenniferzed) | 70.32 | 95% | 2017-10-10 |
| 1573. | slagtherisen (slagtherisen) | 70.27 | 98% | 2018-03-23 |
| 1574. | Jordy (mrollie) | 70.23 | 96% | 2018-02-19 |
| 1575. | honeybug (honeybugson) | 70.23 | 96% | 2020-05-15 |
| 1576. | Mattias (illmajol) | 70.19 | 97% | 2019-03-12 |
| 1577. | Madelaine (madtherad) | 70.15 | 97% | 2018-07-22 |
| 1578. | Tomaz (tomaz1502) | 70.15 | 95% | 2019-11-14 |
| 1579. | Valk (blankfox) | 70.15 | 97% | 2019-09-03 |
| 1580. | Cal (almostpoetic) | 70.10 | 97% | 2019-01-06 |
| 1581. | Sora (soralimit) | 70.10 | 96% | 2018-03-25 |
| 1582. | XrXr (xrxr) | 70.09 | 95% | 2018-08-02 |
| 1583. | Matthew (tycru) | 69.99 | 95% | 2018-12-05 |
| 1584. | God is love ᗜ (kjb3plover) | 69.97 | 89% | 2019-06-28 |
| 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 |