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 |
---|---|---|---|---|
1481. | shui (sammi76) | 71.88 | 97% | 2017-11-16 |
1482. | Edebus (edebus) | 71.87 | 96% | 2019-01-06 |
1483. | Twoja (frosty666) | 71.87 | 95% | 2017-10-16 |
1484. | Akira (akira1957) | 71.76 | 96% | 2018-05-19 |
1485. | Shawn (koveus) | 71.73 | 97% | 2019-03-25 |
1486. | Eshan (mister_mediocre) | 71.68 | 94% | 2019-04-02 |
1487. | ok (herbaltea) | 71.66 | 95% | 2020-09-27 |
1488. | jk- (justkidding_) | 71.66 | 96% | 2020-01-27 |
1489. | oneguardsam (oneguardsam) | 71.65 | 98% | 2020-05-05 |
1490. | ダニー (dannyhehexd) | 71.50 | 96% | 2020-08-18 |
1491. | hiKalS (hikals) | 71.46 | 96% | 2017-10-10 |
1492. | Ernest (kevinkrish) | 71.42 | 96% | 2018-09-28 |
1493. | Michael (whittneyinthetub) | 71.42 | 96% | 2018-03-15 |
1494. | CARLO (cjbal) | 71.37 | 97% | 2020-11-01 |
1495. | Jiro (unibo) | 71.32 | 97% | 2020-10-09 |
1496. | Peter (peterruse) | 71.32 | 97% | 2020-10-16 |
1497. | James (karonar) | 71.31 | 97% | 2018-12-10 |
1498. | xena (scogx3281) | 71.24 | 95% | 2020-02-03 |
1499. | Joshua (pigdog435) | 71.24 | 97% | 2018-08-01 |
1500. | TTtie (tttie) | 71.22 | 96% | 2020-06-26 |
1501. | Nichole (nboise) | 71.21 | 96% | 2020-05-05 |
1502. | Ali (ali024) | 71.19 | 96% | 2018-03-29 |
1503. | Justin (minionace) | 71.14 | 95% | 2018-02-05 |
1504. | Jared (infamousjj) | 71.09 | 94% | 2018-02-21 |
1505. | Rob (robear72) | 71.08 | 96% | 2019-08-15 |
1506. | Andy (kwoktopus) | 71.08 | 98% | 2020-11-02 |
1507. | Mark (phoenixxix) | 71.06 | 94% | 2019-06-03 |
1508. | Said (surrenderordie) | 71.05 | 98% | 2020-07-23 |
1509. | d0ge (d0ge) | 71.03 | 96% | 2019-03-25 |
1510. | Austin (goodrichinator) | 71.01 | 96% | 2020-10-16 |
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 |