Text #3550368

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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Leaders

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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

Universes

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