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 |
---|---|---|---|---|
884. | T (tcubesak) | 83.30 | 96% | 2017-10-23 |
885. | Marek (lypa) | 83.30 | 97% | 2019-05-01 |
886. | Joshua (joshuacresse) | 83.29 | 98% | 2019-01-29 |
887. | Daniel (dainyal) | 83.29 | 96% | 2020-06-11 |
888. | Christopher (pandaloop) | 83.28 | 96% | 2017-10-21 |
889. | Bryan (bbryanchoi) | 83.27 | 96% | 2020-05-03 |
890. | Cadi (cadihd) | 83.27 | 96% | 2018-01-08 |
891. | Cameron (jhill1997) | 83.25 | 97% | 2018-01-08 |
892. | bang bang (mjf_18) | 83.25 | 97% | 2019-12-31 |
893. | Andy (andyyu2004) | 83.25 | 98% | 2020-04-17 |
894. | Chris (chriswck) | 83.23 | 98% | 2020-07-11 |
895. | Linfeng (llinfeng) | 83.23 | 97% | 2018-12-28 |
896. | Camden (mypenguinbuddy) | 83.18 | 96% | 2020-05-15 |
897. | Cisco... (slowracerx) | 83.14 | 97% | 2018-09-18 |
898. | Stea (fracticals) | 83.14 | 97% | 2018-12-28 |
899. | Tobias π₯Ίππ (tobimori) | 83.13 | 97% | 2020-06-03 |
900. | Kohei (vvacid) | 83.09 | 97% | 2018-05-17 |
901. | Tmo (zvblast) | 83.08 | 99% | 2018-11-16 |
902. | J (jhreb) | 83.08 | 98% | 2020-01-25 |
903. | 1myvar (chowchunfu) | 83.05 | 96% | 2018-12-10 |
904. | svime (svime) | 83.03 | 96% | 2018-12-05 |
905. | Elijamin (mejikmahn) | 83.00 | 98% | 2020-11-09 |
906. | JuantonomoeTTV (juantonomoe) | 82.96 | 97% | 2019-05-09 |
907. | R (frickoff) | 82.92 | 96% | 2018-07-04 |
908. | Chieh laptop (leejay8011piq) | 82.88 | 99% | 2018-09-21 |
909. | @ _ @ (sundainho) | 82.87 | 97% | 2018-03-22 |
910. | cum lover (dotctsk) | 82.85 | 97% | 2020-12-01 |
911. | π (milan_) | 82.85 | 96% | 2018-01-05 |
912. | Gabriel (tohm) | 82.83 | 98% | 2018-11-28 |
913. | Qwerty (qwerty80801) | 82.81 | 99% | 2020-10-02 |
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 |