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 |
---|---|---|---|---|
791. | I (excelsiate) | 85.38 | 98% | 2018-01-06 |
792. | Daniaal (bigchungus_) | 85.37 | 96% | 2020-09-29 |
793. | imako (imako) | 85.35 | 97% | 2018-06-28 |
794. | Austin (ajrocks99) | 85.35 | 97% | 2020-10-31 |
795. | Night (jiddery) | 85.34 | 99% | 2019-12-09 |
796. | One last time (ubershah) | 85.32 | 97% | 2018-11-25 |
797. | da (causenetsofv) | 85.29 | 99% | 2020-11-07 |
798. | David (yeweon) | 85.27 | 96% | 2017-10-14 |
799. | Rachael (rachael66) | 85.25 | 98% | 2019-08-12 |
800. | will (wpham34) | 85.22 | 97% | 2018-06-01 |
801. | Lee (lee_randomly) | 85.21 | 96% | 2020-09-07 |
802. | THeasdf5 (typehans) | 85.18 | 98% | 2018-02-20 |
803. | Sam (numberonemega) | 85.17 | 96% | 2018-09-09 |
804. | Dan (dandarandan) | 85.15 | 96% | 2019-02-03 |
805. | no (jonah1357) | 85.14 | 95% | 2020-12-07 |
806. | jack (jackracer23) | 85.11 | 98% | 2019-07-08 |
807. | help (shung3) | 85.09 | 97% | 2020-08-25 |
808. | Tommy (tommyn123) | 85.09 | 98% | 2018-10-06 |
809. | (maybenonquit) | 85.07 | 97% | 2020-04-12 |
810. | dalineth (dalineth) | 85.06 | 97% | 2019-03-23 |
811. | tannoobkod (tannoobkodz) | 85.03 | 97% | 2018-10-05 |
812. | Pacific Monk (pacificmonk) | 85.03 | 98% | 2018-04-18 |
813. | Prasannjeet (misteeque) | 85.01 | 97% | 2018-09-14 |
814. | Frank (frankxu) | 85.01 | 97% | 2018-12-23 |
815. | anyou (asianguy2816) | 84.99 | 96% | 2020-11-16 |
816. | Ye (yexiaojun) | 84.99 | 97% | 2019-07-13 |
817. | Daggerpov (read_my_name) | 84.98 | 98% | 2019-09-25 |
818. | Jake (mageyoulook) | 84.98 | 97% | 2019-04-22 |
819. | Labo (labo_mata123) | 84.97 | 96% | 2019-11-08 |
820. | Derek (derekconner26) | 84.97 | 97% | 2019-10-29 |
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 |