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 |
---|---|---|---|---|
522. | Emilian (synnek1337) | 93.03 | 97% | 2020-10-25 |
523. | zero (crispyasf) | 93.02 | 96% | 2018-01-28 |
524. | Hamski (maythose) | 92.95 | 97% | 2020-06-11 |
525. | g (georgetianke) | 92.84 | 99% | 2020-04-02 |
526. | THE JEWELL (wildhorsesthe2nd) | 92.82 | 99% | 2019-10-07 |
527. | Chris (bunkieme) | 92.80 | 96% | 2020-08-14 |
528. | Yoon (yoonnayy) | 92.80 | 97% | 2018-01-29 |
529. | Cam (qwestfinder) | 92.78 | 97% | 2018-11-07 |
530. | Finn (finnark) | 92.78 | 97% | 2019-08-11 |
531. | Andy (summermint) | 92.75 | 98% | 2017-10-15 |
532. | Kevin (clearlynotkevin) | 92.74 | 98% | 2019-01-11 |
533. | Vitres (irving1234028) | 92.72 | 96% | 2019-03-31 |
534. | free 21 savage (acholo) | 92.69 | 97% | 2018-12-30 |
535. | Zaoxa (enkryptsyon) | 92.67 | 96% | 2020-03-12 |
536. | papa=d (diggaxgod) | 92.66 | 97% | 2019-11-21 |
537. | ジョーヨ (joeyo) | 92.62 | 98% | 2018-12-04 |
538. | Kacper (frgtn) | 92.60 | 97% | 2018-05-10 |
539. | Evan (evanjmckenna) | 92.58 | 96% | 2019-02-19 |
540. | Arach (sun_not_real) | 92.54 | 98% | 2020-10-11 |
541. | Aisha (mommaveg) | 92.53 | 98% | 2019-04-22 |
542. | Yaseen (bananabeast) | 92.44 | 95% | 2019-09-05 |
543. | Radha (tostytoast) | 92.39 | 98% | 2020-11-16 |
544. | Spencer (soliloquial) | 92.38 | 96% | 2018-05-06 |
545. | Ahmadi (transporter) | 92.36 | 96% | 2018-03-30 |
546. | Nate (thatguyx) | 92.23 | 97% | 2019-07-29 |
547. | Laggy (thefitfatass) | 92.21 | 98% | 2018-12-23 |
548. | ari (_paperbird_) | 92.21 | 97% | 2019-04-18 |
549. | sos (typeracer_player111) | 92.20 | 97% | 2020-08-30 |
550. | aqibm (aqibm) | 92.17 | 96% | 2018-02-19 |
551. | (monpre) | 92.17 | 98% | 2020-11-17 |
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 |