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 |
---|---|---|---|---|
1213. | Robert (mrluigi123) | 76.88 | 95% | 2018-10-09 |
1214. | ted (sayonara999) | 76.83 | 97% | 2018-12-26 |
1215. | Hukouma (hukouma) | 76.83 | 95% | 2020-07-22 |
1216. | Simon (szheng17) | 76.81 | 96% | 2019-10-19 |
1217. | Free Palestine (dvorak_king) | 76.77 | 94% | 2020-09-08 |
1218. | Keith (kojiro24) | 76.76 | 96% | 2019-10-24 |
1219. | Rafi (brownvitalik) | 76.76 | 97% | 2020-08-10 |
1220. | Fishykek (consigliere) | 76.70 | 97% | 2017-10-13 |
1221. | irdyums (irdyums) | 76.70 | 96% | 2018-03-16 |
1222. | Genesis (buasch) | 76.69 | 96% | 2018-06-17 |
1223. | Tim (thole) | 76.64 | 97% | 2019-05-24 |
1224. | Rlslngcloud (rlslngcloud) | 76.59 | 95% | 2018-12-14 |
1225. | Nikola (shporet) | 76.58 | 98% | 2019-10-14 |
1226. | Korey (korizmo) | 76.56 | 96% | 2019-04-27 |
1227. | LB (man_onatree) | 76.56 | 96% | 2020-11-12 |
1228. | keith (krazedkat) | 76.56 | 95% | 2020-06-13 |
1229. | 🌠Rubby🌠(mikerubby) | 76.55 | 97% | 2020-02-09 |
1230. | mood (aquariusflower) | 76.53 | 97% | 2018-12-25 |
1231. | Senecaz (senecaz) | 76.49 | 98% | 2018-01-05 |
1232. | Phu (sleepiness) | 76.48 | 97% | 2018-12-30 |
1233. | Micaherl (sunsoutbunsout) | 76.47 | 97% | 2019-09-27 |
1234. | TehEpikDuck (myskillgroup) | 76.44 | 96% | 2020-07-26 |
1235. | Allysohn (allysohn) | 76.37 | 94% | 2020-11-15 |
1236. | Vinh (vista32493) | 76.36 | 96% | 2020-09-25 |
1237. | Trenten (guitars12) | 76.32 | 95% | 2020-03-26 |
1238. | huddled (haraldgb) | 76.30 | 97% | 2020-06-05 |
1239. | dedknd (dedknd) | 76.29 | 98% | 2020-08-24 |
1240. | kauron (kauron) | 76.27 | 96% | 2019-04-05 |
1241. | semimak (idimoku) | 76.24 | 96% | 2020-11-04 |
1242. | TW (trwo) | 76.23 | 98% | 2018-10-25 |
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 |