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 |
---|---|---|---|---|
1596. | f1_racer (f1_racer_car) | 69.07 | 97% | 2020-09-07 |
1597. | Hadi (charaka) | 69.02 | 98% | 2018-12-24 |
1598. | Tristan (tristanjp12) | 69.02 | 94% | 2019-08-08 |
1599. | cringer (typecringe) | 68.99 | 94% | 2018-12-24 |
1600. | 65best (dunneljir) | 68.96 | 95% | 2019-05-22 |
1601. | Jiang (jghjianghan) | 68.95 | 94% | 2018-12-03 |
1602. | Lloyd (lloydd) | 68.94 | 96% | 2020-10-02 |
1603. | DWG (lsunixl) | 68.93 | 97% | 2020-05-13 |
1604. | TheWetard (thebastard) | 68.92 | 96% | 2019-09-20 |
1605. | B R E N loves Mako (pugslyyy) | 68.85 | 93% | 2018-06-28 |
1606. | Coffee (coffeesan) | 68.81 | 94% | 2019-07-11 |
1607. | Quinn (peea) | 68.76 | 97% | 2020-11-30 |
1608. | Seyoung (seyoung) | 68.74 | 95% | 2018-12-25 |
1609. | Bri (tidepodsknuckles) | 68.74 | 97% | 2018-08-16 |
1610. | Rena (renanav) | 68.74 | 96% | 2018-12-24 |
1611. | A (kmos) | 68.71 | 96% | 2020-03-17 |
1612. | victor (swegboi) | 68.70 | 95% | 2017-11-06 |
1613. | rk61 (lowda9) | 68.66 | 97% | 2017-12-26 |
1614. | Alexander (offbeat5024) | 68.64 | 97% | 2019-12-30 |
1615. | abraham (shewdiebro) | 68.58 | 94% | 2018-12-28 |
1616. | Ephemeral_ (ephemeral_meatsac) | 68.56 | 95% | 2020-03-26 |
1617. | Mahmoud (opssheesh) | 68.50 | 95% | 2020-02-03 |
1618. | William (12grainbreads) | 68.49 | 98% | 2020-07-07 |
1619. | Jebediah (bakerman144) | 68.41 | 98% | 2020-03-27 |
1620. | Mark (haxos) | 68.39 | 93% | 2020-11-08 |
1621. | White (beast_5) | 68.37 | 96% | 2020-06-07 |
1622. | Keith (keithlau) | 68.34 | 96% | 2019-06-01 |
1623. | Jacob (racelive) | 68.32 | 97% | 2017-10-18 |
1624. | imnotanygood (handicaped) | 68.24 | 96% | 2019-04-23 |
1625. | hayden (ryhxo) | 68.24 | 96% | 2019-02-24 |
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 |