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 |
|---|---|---|---|---|
| 1545. | K (kevt138) | 70.80 | 96% | 2018-01-05 |
| 1546. | 𝕋𝕒𝕫𝕫𝕒 (tazza2) | 70.80 | 96% | 2020-06-14 |
| 1547. | Anssi (nininananunu) | 70.79 | 96% | 2017-12-02 |
| 1548. | Lance (chunkysoup) | 70.74 | 94% | 2018-11-26 |
| 1549. | yaha (mastercoolz) | 70.74 | 98% | 2017-11-08 |
| 1550. | Eloy (swekingeib) | 70.72 | 97% | 2019-09-20 |
| 1551. | Sanic (192378) | 70.68 | 95% | 2020-12-08 |
| 1552. | Ish (asdfwhatyouknow) | 70.67 | 96% | 2018-11-29 |
| 1553. | rohit_india (rohit_typefast) | 70.66 | 98% | 2018-12-01 |
| 1554. | Santiago (drebexler) | 70.66 | 95% | 2020-10-15 |
| 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 |
| 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 |