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.
676 total characters in this text.
View Pit Stop page for this text
Rank | Username | WPM | Accuracy | Date |
---|---|---|---|---|
1400. | Rowe (cubechild1) | 73.32 | 97% | 2019-03-21 |
1401. | Nate (toiletsplash) | 73.31 | 98% | 2018-12-01 |
1402. | Laco (koomp) | 73.31 | 97% | 2019-10-01 |
1403. | poo poo eater (300_wpm_avg) | 73.28 | 94% | 2020-04-26 |
1404. | Harvie (harviiep) | 73.27 | 97% | 2018-06-28 |
1405. | Zhikouan (mikelee543) | 73.26 | 97% | 2018-03-27 |
1406. | Raymond (szlesh) | 73.22 | 96% | 2019-09-28 |
1407. | qtq🐇🍊🍰 (qtqtq) | 73.22 | 99% | 2019-11-23 |
1408. | joe (joscef) | 73.22 | 96% | 2020-08-10 |
1409. | Boon Chuan (nitrolego) | 73.21 | 96% | 2020-01-15 |
1410. | Zen (zainprox) | 73.21 | 97% | 2020-01-02 |
1411. | reysette (reysettemart) | 73.19 | 96% | 2020-08-07 |
1412. | Corey (oldmanbrink) | 73.17 | 96% | 2019-04-26 |
1413. | Ahead of you (wadehuangjr) | 73.16 | 97% | 2020-09-29 |
1414. | Jimmy (whiteice) | 73.15 | 95% | 2020-01-01 |
1415. | Ronak (rdatta456) | 73.13 | 96% | 2019-07-01 |
1416. | Mark (figzes) | 73.04 | 95% | 2019-08-18 |
1417. | Hah (verdaderopan) | 72.99 | 97% | 2019-07-26 |
1418. | Chetan (ch374n) | 72.95 | 96% | 2019-08-27 |
1419. | LimeAle (tofuloaf) | 72.94 | 95% | 2018-12-27 |
1420. | Raj2631 (raj2631) | 72.92 | 96% | 2020-05-19 |
1421. | James (wnston) | 72.88 | 95% | 2020-06-07 |
1422. | Atticus (plutakis) | 72.87 | 95% | 2018-06-20 |
1423. | Rodney (rodneyslafuente) | 72.84 | 96% | 2020-11-16 |
1424. | Giorgi (0_alien) | 72.84 | 96% | 2017-11-16 |
1425. | twitch.tv/darkmatterv4 (blo... | 72.83 | 94% | 2020-07-14 |
1426. | erk (estalow) | 72.83 | 95% | 2019-05-07 |
1427. | Neko (pippaola) | 72.82 | 97% | 2017-10-11 |
1428. | 144p 1998 VW Beetle (stryke... | 72.82 | 97% | 2018-12-12 |
1429. | Graham (graham152) | 72.82 | 97% | 2019-09-24 |
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 |