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 |
---|---|---|---|---|
745. | me (suited4hike) | 86.32 | 95% | 2019-09-13 |
746. | Colin (geosyog) | 86.31 | 98% | 2020-08-29 |
747. | https://youtu.be/dQw4w9WgXc... | 86.30 | 95% | 2020-11-10 |
748. | Felipe (profeccter1611) | 86.30 | 97% | 2017-10-16 |
749. | Weegee (weegeeweeg) | 86.28 | 98% | 2018-12-20 |
750. | revaN (ashun) | 86.24 | 97% | 2020-09-08 |
751. | Pei Bin (cheongpeibin) | 86.24 | 98% | 2019-01-07 |
752. | yall slow af (milkoreo) | 86.24 | 95% | 2019-05-30 |
753. | sally (creamdonut) | 86.22 | 97% | 2019-10-01 |
754. | henry 🎩 (henzolo) | 86.21 | 95% | 2022-02-08 |
755. | Keziah (kookiru) | 86.20 | 97% | 2020-12-01 |
756. | Andy (philivox) | 86.19 | 96% | 2018-02-23 |
757. | carlos (carlit0) | 86.18 | 98% | 2019-08-08 |
758. | Alpha (calae) | 86.15 | 98% | 2020-02-07 |
759. | dylan (dhuangg) | 86.15 | 97% | 2020-02-01 |
760. | taro (taro_curly) | 86.06 | 98% | 2018-07-15 |
761. | Jakub (kebabino) | 86.05 | 97% | 2019-04-28 |
762. | Mafuso (mafuso) | 85.99 | 97% | 2019-08-25 |
763. | Brent (brentjones333) | 85.98 | 97% | 2018-02-03 |
764. | Duncan (dkbrk) | 85.97 | 98% | 2020-06-02 |
765. | Dmitry (voidpointer64) | 85.93 | 96% | 2020-09-12 |
766. | Jocho Muaguadabo (alezander... | 85.92 | 98% | 2019-10-07 |
767. | Luna (vexara) | 85.91 | 98% | 2017-12-09 |
768. | tehmbot (timu) | 85.89 | 96% | 2020-12-04 |
769. | Jane (janeshepard) | 85.87 | 97% | 2019-09-27 |
770. | Felix (exilef) | 85.80 | 98% | 2019-03-31 |
771. | YunJae (crimsontide0) | 85.80 | 97% | 2018-06-17 |
772. | Nick (njcanderson) | 85.76 | 97% | 2017-12-07 |
773. | a (coolguy73) | 85.75 | 96% | 2019-10-31 |
774. | Alec (thezoltan94) | 85.74 | 96% | 2018-03-13 |
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 |