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 |
---|---|---|---|---|
1357. | Jeshwan (itsshade) | 74.31 | 97% | 2019-11-27 |
1358. | Todd (t0dd1337) | 74.31 | 95% | 2020-08-29 |
1359. | Go D. (deeated) | 74.29 | 96% | 2020-11-25 |
1360. | ap (nguyen4) | 74.28 | 96% | 2018-06-06 |
1361. | Christian (cott8161) | 74.28 | 96% | 2020-01-16 |
1362. | Josh (jtreadway) | 74.25 | 96% | 2018-08-14 |
1363. | Kyu (kyukang) | 74.21 | 95% | 2018-03-15 |
1364. | Grotesque (grotesquevinny) | 74.20 | 95% | 2020-02-15 |
1365. | Jake (jakesk) | 74.20 | 96% | 2020-08-24 |
1366. | Juan (unbilivavl) | 74.20 | 96% | 2020-08-24 |
1367. | Someone (someonetyping) | 74.17 | 98% | 2020-05-21 |
1368. | Noah (noah_o_n) | 74.15 | 95% | 2019-01-23 |
1369. | roy (likmyleg) | 74.15 | 97% | 2020-11-06 |
1370. | Zhivko (zikica97) | 74.12 | 97% | 2019-05-09 |
1371. | Sonny (sonson88) | 74.04 | 96% | 2017-10-07 |
1372. | Duduk (dudukmete) | 74.03 | 95% | 2019-01-06 |
1373. | FromtonRouge (fromtonrouge) | 74.01 | 98% | 2018-01-14 |
1374. | (4lsi3w544lwi4lk) | 73.98 | 96% | 2020-11-15 |
1375. | clerk (csmith2) | 73.95 | 97% | 2018-09-01 |
1376. | Neel (neel19) | 73.93 | 96% | 2020-08-08 |
1377. | Annie (anniexu) | 73.89 | 95% | 2019-02-12 |
1378. | Eiv (mechiguy) | 73.89 | 99% | 2019-06-16 |
1379. | sonderr (battery_sr) | 73.89 | 95% | 2019-11-06 |
1380. | Shawn (filipinofriend) | 73.88 | 96% | 2019-08-11 |
1381. | Matthew (matthew243342) | 73.86 | 95% | 2018-10-25 |
1382. | Emil (emle10) | 73.84 | 95% | 2020-07-25 |
1383. | keni (kenibot) | 73.81 | 95% | 2020-09-07 |
1384. | Jason (bigswass) | 73.80 | 96% | 2018-12-20 |
1385. | Duy (fooom) | 73.80 | 96% | 2019-10-20 |
1386. | sheep (theonesheep) | 73.80 | 97% | 2020-08-29 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
New English Texts | 1 | 108.31 | May 26, 2022 |