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 |
|---|---|---|---|---|
| 1497. | jk- (justkidding_) | 71.66 | 96% | 2020-01-27 |
| 1498. | oneguardsam (oneguardsam) | 71.65 | 98% | 2020-05-05 |
| 1499. | ダニー (dannyhehexd) | 71.50 | 96% | 2020-08-18 |
| 1500. | hiKalS (hikals) | 71.46 | 96% | 2017-10-10 |
| 1501. | Ernest (kevinkrish) | 71.42 | 96% | 2018-09-28 |
| 1502. | Michael (whittneyinthetub) | 71.42 | 96% | 2018-03-15 |
| 1503. | CARLO (cjbal) | 71.37 | 97% | 2020-11-01 |
| 1504. | Jiro (unibo) | 71.32 | 97% | 2020-10-09 |
| 1505. | Peter (peterruse) | 71.32 | 97% | 2020-10-16 |
| 1506. | James (karonar) | 71.31 | 97% | 2018-12-10 |
| 1507. | xena (scogx3281) | 71.24 | 95% | 2020-02-03 |
| 1508. | TTtie (tttie) | 71.22 | 96% | 2020-06-26 |
| 1509. | Nichole (nboise) | 71.21 | 96% | 2020-05-05 |
| 1510. | Ali (ali024) | 71.19 | 96% | 2018-03-29 |
| 1511. | Justin (minionace) | 71.14 | 95% | 2018-02-05 |
| 1512. | Jared (infamousjj) | 71.09 | 94% | 2018-02-21 |
| 1513. | Rob (robear72) | 71.08 | 96% | 2019-08-15 |
| 1514. | Andy (kwoktopus) | 71.08 | 98% | 2020-11-02 |
| 1515. | Mark (phoenixxix) | 71.06 | 94% | 2019-06-03 |
| 1516. | Said (surrenderordie) | 71.05 | 98% | 2020-07-23 |
| 1517. | Ben (bacco) | 71.05 | 97% | 2018-02-08 |
| 1518. | d0ge (d0ge) | 71.03 | 96% | 2019-03-25 |
| 1519. | Austin (goodrichinator) | 71.01 | 96% | 2020-10-16 |
| 1520. | gzip1 (gzip1) | 71.00 | 97% | 2019-10-11 |
| 1521. | Andrej (apalias) | 70.97 | 97% | 2020-09-11 |
| 1522. | Justin (ohshitbye) | 70.96 | 97% | 2020-07-11 |
| 1523. | DangdutKoplo (dangdutkoplo2) | 70.91 | 96% | 2019-04-14 |
| 1524. | Yzmael (yzmael156) | 70.89 | 97% | 2019-03-06 |
| 1525. | Grand Magus (aimtiaz20) | 70.87 | 97% | 2019-05-23 |
| 1526. | Bianca Juliene (biancajuliene) | 70.87 | 95% | 2020-08-14 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | 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 |