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 |
---|---|---|---|---|
917. | cortmarshal (cortmarshal) | 82.73 | 96% | 2020-12-07 |
918. | Bmxyy (bmx30111) | 82.72 | 97% | 2019-07-25 |
919. | Eran (umm_eran) | 82.69 | 97% | 2020-12-08 |
920. | Nikolaj (nikolaj808) | 82.68 | 96% | 2020-06-25 |
921. | Reuben (phyterjet) | 82.64 | 97% | 2018-08-01 |
922. | dead (karovin) | 82.63 | 95% | 2018-03-14 |
923. | Jason (jasonbetterthanyouall) | 82.58 | 97% | 2020-04-21 |
924. | kaitlyn (zapy76) | 82.57 | 97% | 2020-07-26 |
925. | yong (topcool) | 82.50 | 96% | 2018-10-26 |
926. | ehj53 (ehj53) | 82.49 | 98% | 2019-08-27 |
927. | gab (ggzl1998) | 82.44 | 97% | 2020-11-15 |
928. | o.O (yorickvw) | 82.44 | 96% | 2018-05-14 |
929. | Tess (makeleletoulalan) | 82.43 | 97% | 2017-11-01 |
930. | Marc (exorbis) | 82.39 | 96% | 2020-03-01 |
931. | MooD (xslel) | 82.39 | 97% | 2020-11-17 |
932. | Mod (modulatus) | 82.38 | 96% | 2020-11-26 |
933. | Zach (morcheeba) | 82.36 | 98% | 2020-01-19 |
934. | Norman (dancingcat) | 82.32 | 97% | 2018-01-15 |
935. | Demancer (demancer) | 82.32 | 98% | 2019-02-21 |
936. | Alex (eggstreme) | 82.31 | 96% | 2019-06-18 |
937. | Filip (filip26) | 82.29 | 96% | 2020-06-25 |
938. | Bobbatron (bobbatron808) | 82.23 | 97% | 2018-02-17 |
939. | Cluody132 (cluody132) | 82.22 | 97% | 2017-12-14 |
940. | s. (capslooock) | 82.21 | 96% | 2019-02-16 |
941. | crisol (goryubuster) | 82.20 | 95% | 2019-10-04 |
942. | k (kb2005) | 82.18 | 99% | 2020-08-27 |
943. | Vandrick (vandrick) | 82.18 | 97% | 2017-10-26 |
944. | Will (shadzalt) | 82.17 | 97% | 2020-04-10 |
945. | Panda! at the Disco (chardb... | 82.16 | 97% | 2020-02-01 |
946. | Raalylen (raalylen) | 82.16 | 97% | 2020-07-31 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,909 | 89.29 | 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 |