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 |
---|---|---|---|---|
1152. | Karan (karanbajaj23) | 78.14 | 96% | 2019-03-08 |
1153. | Migs (amsc) | 78.11 | 97% | 2018-07-19 |
1154. | S = klnW (sklnw) | 78.10 | 97% | 2019-07-09 |
1155. | youwonttype (youwonttype) | 78.09 | 98% | 2018-01-11 |
1156. | Discipline (huynhkhacdat2) | 78.06 | 97% | 2018-10-02 |
1157. | Daniel (brickoven) | 78.05 | 97% | 2018-08-17 |
1158. | tstats[yungskrunt] (yungskr... | 78.04 | 96% | 2020-05-03 |
1159. | toenails_sauce (toenails_sa... | 78.03 | 98% | 2019-07-27 |
1160. | Kristin (tchncolorcupcake) | 78.02 | 97% | 2020-11-12 |
1161. | ronald (roclus) | 77.96 | 97% | 2018-05-05 |
1162. | Richard (rockpile) | 77.95 | 97% | 2018-12-06 |
1163. | Dahhr (dahhr) | 77.87 | 97% | 2018-03-25 |
1164. | Worm (ryanbaseball7) | 77.87 | 96% | 2018-05-08 |
1165. | Al Ryan (02sa) | 77.77 | 96% | 2018-01-15 |
1166. | Zack (bungmcbooga) | 77.77 | 97% | 2020-11-12 |
1167. | Paul (paulwhoisaghost) | 77.77 | 97% | 2019-06-05 |
1168. | Tootels (joenasha10) | 77.76 | 97% | 2018-12-12 |
1169. | Jean (seawardsalmon6) | 77.76 | 98% | 2020-09-24 |
1170. | Krishna (cold5r) | 77.75 | 96% | 2019-02-03 |
1171. | Yandre (yandrelearnstotype) | 77.74 | 96% | 2018-09-03 |
1172. | Josh (joshindahood) | 77.69 | 98% | 2019-11-20 |
1173. | João (johnrik) | 77.68 | 97% | 2018-02-15 |
1174. | vamsi (vamsivadrevu) | 77.67 | 97% | 2020-12-07 |
1175. | Tony (nomind) | 77.65 | 96% | 2020-12-14 |
1176. | Cove (cove) | 77.62 | 97% | 2019-04-17 |
1177. | Danny (dannynp) | 77.59 | 97% | 2018-03-17 |
1178. | Jason (jasonw1121) | 77.59 | 94% | 2019-09-02 |
1179. | Logan (theperson60) | 77.58 | 96% | 2018-01-19 |
1180. | gameboytre (gameboytre) | 77.53 | 96% | 2020-11-29 |
1181. | Pog (deftst) | 77.49 | 95% | 2018-12-28 |
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 |