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 |
---|---|---|---|---|
1226. | Tim (thole) | 76.64 | 97% | 2019-05-24 |
1227. | Rlslngcloud (rlslngcloud) | 76.59 | 95% | 2018-12-14 |
1228. | Nikola (shporet) | 76.58 | 98% | 2019-10-14 |
1229. | Korey (korizmo) | 76.56 | 96% | 2019-04-27 |
1230. | LB (man_onatree) | 76.56 | 96% | 2020-11-12 |
1231. | keith (krazedkat) | 76.56 | 95% | 2020-06-13 |
1232. | 🌠Rubby🌠(mikerubby) | 76.55 | 97% | 2020-02-09 |
1233. | mood (aquariusflower) | 76.53 | 97% | 2018-12-25 |
1234. | Senecaz (senecaz) | 76.49 | 98% | 2018-01-05 |
1235. | Phu (sleepiness) | 76.48 | 97% | 2018-12-30 |
1236. | Micaherl (sunsoutbunsout) | 76.47 | 97% | 2019-09-27 |
1237. | TehEpikDuck (myskillgroup) | 76.44 | 96% | 2020-07-26 |
1238. | Allysohn (allysohn) | 76.37 | 94% | 2020-11-15 |
1239. | Vinh (vista32493) | 76.36 | 96% | 2020-09-25 |
1240. | Trenten (guitars12) | 76.32 | 95% | 2020-03-26 |
1241. | huddled (haraldgb) | 76.30 | 97% | 2020-06-05 |
1242. | dedknd (dedknd) | 76.29 | 98% | 2020-08-24 |
1243. | kauron (kauron) | 76.27 | 96% | 2019-04-05 |
1244. | semimak (idimoku) | 76.24 | 96% | 2020-11-04 |
1245. | TW (trwo) | 76.23 | 98% | 2018-10-25 |
1246. | ឵឵ (omgitzisquidi) | 76.18 | 98% | 2019-06-28 |
1247. | Tariq (htariq) | 76.17 | 98% | 2019-12-17 |
1248. | SilicGK (silicgk) | 76.17 | 95% | 2020-06-22 |
1249. | Mendel (mendeljacks) | 76.15 | 98% | 2019-07-11 |
1250. | . (tj44) | 76.14 | 95% | 2019-10-03 |
1251. | gangreenie (gangreenie) | 76.13 | 98% | 2019-12-03 |
1252. | amy (rose51203) | 76.00 | 96% | 2020-06-11 |
1253. | Ryan (giantsfan39) | 75.98 | 96% | 2019-05-17 |
1254. | SPEXINDER (forest7) | 75.95 | 95% | 2020-09-09 |
1255. | Bach (bwv988) | 75.94 | 97% | 2019-08-29 |
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 |