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 |
---|---|---|---|---|
1180. | gameboytre (gameboytre) | 77.53 | 96% | 2020-11-29 |
1181. | Pog (deftst) | 77.49 | 95% | 2018-12-28 |
1182. | Anton (racketen) | 77.47 | 98% | 2020-05-03 |
1183. | Ali (afregistry) | 77.43 | 97% | 2020-11-16 |
1184. | greg (drsharc) | 77.43 | 96% | 2019-05-19 |
1185. | madis (madismadismad) | 77.43 | 98% | 2019-07-08 |
1186. | :( (altrocality_dvorak_acc) | 77.42 | 96% | 2020-10-03 |
1187. | Andrew (alz2) | 77.42 | 95% | 2018-07-02 |
1188. | Bodhi$attiva (ptran) | 77.42 | 98% | 2018-03-23 |
1189. | ♿♿♿ (kavalan) | 77.41 | 95% | 2019-03-06 |
1190. | Missy (lovelydy) | 77.41 | 98% | 2019-05-02 |
1191. | Big Tuna (dominicgangx) | 77.37 | 97% | 2019-11-14 |
1192. | Ed (eds69) | 77.37 | 97% | 2019-11-03 |
1193. | elnino (elnio2803) | 77.32 | 97% | 2018-11-16 |
1194. | sugi (dea_agent) | 77.26 | 96% | 2020-04-01 |
1195. | KC (hotdogkc) | 77.22 | 98% | 2018-10-14 |
1196. | eggs979 (eggs979) | 77.21 | 97% | 2018-06-18 |
1197. | yorha (automata) | 77.21 | 96% | 2017-10-15 |
1198. | Ismail (aismail90) | 77.21 | 96% | 2020-09-28 |
1199. | type (ohwow17) | 77.21 | 96% | 2019-11-05 |
1200. | Park Shin Hye (yipaepaen) | 77.19 | 96% | 2018-10-28 |
1201. | BobDaAsianBuilda (fortnitef... | 77.08 | 96% | 2019-11-24 |
1202. | grimpatron (grimpatron) | 77.06 | 96% | 2019-05-19 |
1203. | toki (kizunajemini2205) | 77.05 | 96% | 2020-12-09 |
1204. | ☼Nikola☼ (5crownik007) | 77.05 | 95% | 2018-10-31 |
1205. | Dmitry (tr0y) | 77.04 | 97% | 2018-10-16 |
1206. | Josephus (josephus) | 77.02 | 96% | 2017-10-19 |
1207. | Korbin (korbinmartin) | 77.02 | 97% | 2020-11-07 |
1208. | Nivekdood (nivekdood) | 77.02 | 96% | 2020-10-12 |
1209. | TeJaun (presteej) | 76.99 | 97% | 2019-12-31 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | 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 |