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 |
|---|---|---|---|---|
| 1170. | ronald (roclus) | 77.96 | 97% | 2018-05-05 |
| 1171. | Richard (rockpile) | 77.95 | 97% | 2018-12-06 |
| 1172. | Worm (ryanbaseball7) | 77.87 | 96% | 2018-05-08 |
| 1173. | Dahhr (dahhr) | 77.87 | 97% | 2018-03-25 |
| 1174. | Paul (paulwhoisaghost) | 77.77 | 97% | 2019-06-05 |
| 1175. | Zack (bungmcbooga) | 77.77 | 97% | 2020-11-12 |
| 1176. | Al Ryan (02sa) | 77.77 | 96% | 2018-01-15 |
| 1177. | Jean (seawardsalmon6) | 77.76 | 98% | 2020-09-24 |
| 1178. | Tootels (joenasha10) | 77.76 | 97% | 2018-12-12 |
| 1179. | Krishna (cold5r) | 77.75 | 96% | 2019-02-03 |
| 1180. | Yandre (yandrelearnstotype) | 77.74 | 96% | 2018-09-03 |
| 1181. | Josh (joshindahood) | 77.69 | 98% | 2019-11-20 |
| 1182. | João (johnrik) | 77.68 | 97% | 2018-02-15 |
| 1183. | vamsi (vamsivadrevu) | 77.67 | 97% | 2020-12-07 |
| 1184. | Tony (nomind) | 77.65 | 96% | 2020-12-14 |
| 1185. | Cove (cove) | 77.62 | 97% | 2019-04-17 |
| 1186. | Jason (jasonw1121) | 77.59 | 94% | 2019-09-02 |
| 1187. | Danny (dannynp) | 77.59 | 97% | 2018-03-17 |
| 1188. | Logan (theperson60) | 77.58 | 96% | 2018-01-19 |
| 1189. | gameboytre (gameboytre) | 77.53 | 96% | 2020-11-29 |
| 1190. | Pog (deftst) | 77.49 | 95% | 2018-12-28 |
| 1191. | Anton (racketen) | 77.47 | 98% | 2020-05-03 |
| 1192. | madis (madismadismad) | 77.43 | 98% | 2019-07-08 |
| 1193. | greg (drsharc) | 77.43 | 96% | 2019-05-19 |
| 1194. | Ali (afregistry) | 77.43 | 97% | 2020-11-16 |
| 1195. | Andrew (alz2) | 77.42 | 95% | 2018-07-02 |
| 1196. | :( (altrocality_dvorak_acc) | 77.42 | 96% | 2020-10-03 |
| 1197. | Bodhi$attiva (ptran) | 77.42 | 98% | 2018-03-23 |
| 1198. | Missy (lovelydy) | 77.41 | 98% | 2019-05-02 |
| 1199. | ♿♿♿ (kavalan) | 77.41 | 95% | 2019-03-06 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | 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 |