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 |
---|---|---|---|---|
626. | Khai (khaikhai2) | 89.70 | 96% | 2020-03-25 |
627. | Baka (bakayen) | 89.70 | 97% | 2020-05-16 |
628. | nonquit (bork1) | 89.69 | 98% | 2018-11-23 |
629. | Paolo (mcnugget25) | 89.69 | 97% | 2020-12-07 |
630. | Zach (salutations443) | 89.68 | 99% | 2019-01-29 |
631. | (carrot_) | 89.66 | 96% | 2020-07-01 |
632. | burppppp (gotburptodo) | 89.64 | 98% | 2019-01-23 |
633. | Riley (rileyborgard) | 89.46 | 98% | 2018-06-13 |
634. | Mauwsan (mauwsan) | 89.44 | 98% | 2019-02-20 |
635. | Madi (xmatth13) | 89.40 | 96% | 2017-12-28 |
636. | Nick (eco_frendly) | 89.37 | 97% | 2020-03-14 |
637. | L (xice) | 89.33 | 97% | 2019-09-10 |
638. | Dylan (dylan_brenner) | 89.31 | 97% | 2019-05-20 |
639. | Speed Cola (zdj361) | 89.31 | 97% | 2020-09-23 |
640. | Elliot_1980_UK (elliot_notts) | 89.30 | 99% | 2019-10-19 |
641. | Alex (hirage) | 89.25 | 98% | 2018-03-19 |
642. | Ted (macfan) | 89.22 | 99% | 2019-02-28 |
643. | Jeffrey (bluepump) | 89.18 | 98% | 2019-04-22 |
644. | Junk (junkzero) | 89.18 | 97% | 2018-10-18 |
645. | Lusssqueta (caraio) | 89.03 | 96% | 2020-08-29 |
646. | Chris (cburgess) | 88.97 | 96% | 2018-09-14 |
647. | Thomas (loboru) | 88.95 | 98% | 2019-05-08 |
648. | Lexi (lexyyy123) | 88.88 | 98% | 2019-04-17 |
649. | Colemak (cubexp208) | 88.84 | 98% | 2020-07-17 |
650. | ⦗10FF⦘ euij (euij) | 88.83 | 96% | 2018-10-28 |
651. | Sidney (gvxx) | 88.81 | 98% | 2019-09-19 |
652. | Afz (afzofa) | 88.76 | 95% | 2020-01-29 |
653. | Anthony (agrit24) | 88.74 | 96% | 2020-04-11 |
654. | Nathaniel (galacticpirate17) | 88.70 | 98% | 2018-05-25 |
655. | Jaunty (jaunty_jalopy) | 88.62 | 99% | 2018-07-22 |
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 |