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 |
---|---|---|---|---|
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 |
1256. | . (trihard7) | 75.87 | 97% | 2017-12-11 |
1257. | Jonathan (jonfranche) | 75.86 | 97% | 2020-03-15 |
1258. | t (zyxx) | 75.86 | 96% | 2019-08-27 |
1259. | Ryan (ramp15514) | 75.86 | 95% | 2020-04-08 |
1260. | k (mc0sta) | 75.84 | 97% | 2020-11-14 |
1261. | じょりちっち (jorichi... | 75.82 | 99% | 2019-07-15 |
1262. | weicer (weicer) | 75.78 | 98% | 2020-08-29 |
1263. | Leander (hactar) | 75.77 | 97% | 2018-08-15 |
1264. | Saidoh (saidoh) | 75.77 | 97% | 2018-03-03 |
1265. | Rob (destructo91) | 75.76 | 96% | 2020-02-17 |
1266. | ekrpat (ekrpatdvorak) | 75.75 | 95% | 2020-01-21 |
1267. | Peter (speedyboi95) | 75.75 | 97% | 2020-07-26 |
1268. | tstats[jancs] (jancs) | 75.73 | 94% | 2020-09-12 |
1269. | joe (lerler246) | 75.71 | 96% | 2019-09-11 |
1270. | cccc (jonathan12panal) | 75.69 | 95% | 2018-02-16 |
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 |