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 |
---|---|---|---|---|
1808. | amin (parich) | 62.11 | 96% | 2020-03-07 |
1809. | Zicheng (bin_laggin) | 62.06 | 96% | 2019-04-16 |
1810. | Panic (panicswitch07) | 61.94 | 95% | 2019-07-26 |
1811. | Yoshi (justayoshi) | 61.93 | 96% | 2020-09-06 |
1812. | lemty (lemty) | 61.91 | 97% | 2019-02-28 |
1813. | mhee (hangzoon) | 61.89 | 94% | 2018-02-12 |
1814. | sarai (yuki3721) | 61.86 | 96% | 2020-07-31 |
1815. | mcshizney (mcshizney) | 61.83 | 97% | 2018-06-20 |
1816. | You (checkicus) | 61.83 | 98% | 2020-06-05 |
1817. | simen (weeooweeoo) | 61.72 | 98% | 2017-12-28 |
1818. | Noah (noahzilla) | 61.67 | 95% | 2020-10-29 |
1819. | MemeDude (memegod01) | 61.63 | 97% | 2017-10-17 |
1820. | suppakit (oloxbangxolo) | 61.61 | 94% | 2019-01-19 |
1821. | KillTheNoise - KSA (missile... | 61.57 | 96% | 2018-08-17 |
1822. | Theodor (chocorolls) | 61.51 | 95% | 2019-07-26 |
1823. | supernoob (krcellucci) | 61.50 | 96% | 2020-08-21 |
1824. | Thorbert (tobtoby) | 61.49 | 94% | 2020-12-20 |
1825. | Luke (lukeleblanc15) | 61.47 | 97% | 2020-07-06 |
1826. | Manraj (man_123lama) | 61.36 | 96% | 2019-07-26 |
1827. | EJ (clarencedc) | 61.23 | 96% | 2020-11-10 |
1828. | TSpin (all_type) | 61.13 | 95% | 2019-08-29 |
1829. | 707 (bigboss26) | 61.09 | 96% | 2020-12-08 |
1830. | zipline (hwiechers) | 61.01 | 96% | 2018-03-22 |
1831. | Dean (mtgapless) | 60.83 | 96.4% | 2023-11-13 |
1832. | himeh (jherrerra) | 60.80 | 97% | 2020-09-09 |
1833. | Antonio (arthur2810) | 60.66 | 97% | 2020-09-06 |
1834. | The126thSidhant (cycle1) | 60.53 | 93% | 2020-04-03 |
1835. | Jakub (dareon) | 60.49 | 95% | 2017-12-17 |
1836. | Pyren (pyren83) | 60.48 | 97% | 2020-09-06 |
1837. | Paperclip (akmalreza) | 60.45 | 94% | 2020-07-19 |
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 |