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 |
---|---|---|---|---|
996. | Vinicius (vknoguti) | 81.17 | 96% | 2019-04-04 |
997. | Tidomann (tidomann) | 81.17 | 97% | 2018-05-22 |
998. | ICHIGONE (kaweeweeboy) | 81.14 | 96% | 2018-02-01 |
999. | Memat (memat) | 81.13 | 97% | 2020-12-15 |
1000. | Raymando (raymando) | 81.12 | 96% | 2019-04-04 |
1001. | Victor (victor142) | 81.09 | 96% | 2018-03-24 |
1002. | snixtho (snixtho) | 81.08 | 97% | 2018-10-05 |
1003. | Joost (jsnellink) | 81.08 | 96% | 2017-11-14 |
1004. | batbold (bb__) | 81.08 | 97% | 2018-05-03 |
1005. | Harwinder (honeyageraccxr) | 81.05 | 97% | 2019-09-25 |
1006. | Harper (cpmaniac) | 81.05 | 95% | 2020-02-29 |
1007. | SugarTyper (sugartyper) | 81.04 | 99% | 2018-09-30 |
1008. | komaru (komaru) | 81.02 | 98% | 2018-05-22 |
1009. | lolzy (lolzywow) | 81.01 | 97% | 2019-12-09 |
1010. | Robin (doubleulol) | 80.98 | 95% | 2019-09-02 |
1011. | Aaron (ayayron123) | 80.96 | 96% | 2017-11-04 |
1012. | Katie (kmt2129) | 80.95 | 99% | 2018-05-14 |
1013. | Terry (lunarmoon) | 80.95 | 97% | 2020-02-12 |
1014. | Rain Kirby (weebwithadog67) | 80.95 | 96% | 2020-12-08 |
1015. | Andrew (mcentag) | 80.89 | 96% | 2018-02-05 |
1016. | Jacquees (ganasha) | 80.89 | 97% | 2019-10-07 |
1017. | Mitchell (sminchdawg) | 80.89 | 97% | 2020-01-17 |
1018. | Daniel (fastsad) | 80.83 | 97% | 2018-09-23 |
1019. | Enrique (ealiagach) | 80.73 | 98% | 2019-01-16 |
1020. | Vladizlav (simbernal) | 80.67 | 97% | 2017-10-19 |
1021. | okkonishi (okkonishi) | 80.62 | 98% | 2020-08-14 |
1022. | Ye (yester1802) | 80.62 | 97% | 2020-04-24 |
1023. | Morris on break (h0nny) | 80.56 | 98% | 2019-03-15 |
1024. | Aidan (aidanb) | 80.56 | 97% | 2019-08-07 |
1025. | Peter (pruse) | 80.54 | 97% | 2020-10-19 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
New English Texts | 1 | 108.31 | May 26, 2022 |