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 |
---|---|---|---|---|
1344. | Aayush (imqwerty) | 74.55 | 95% | 2019-08-29 |
1345. | Vincent (themii154) | 74.51 | 96% | 2020-06-10 |
1346. | Shouen (shouenlee) | 74.49 | 95% | 2020-04-14 |
1347. | nanda bakana (mutality) | 74.48 | 98% | 2018-01-05 |
1348. | BEing VinCI (ppubalo) | 74.47 | 97% | 2019-05-31 |
1349. | nuttiez (nuttlatios) | 74.45 | 97% | 2020-11-09 |
1350. | MacNCheese (macncheeseeeee) | 74.44 | 95% | 2019-06-20 |
1351. | Azenpic (azenpic) | 74.44 | 96% | 2017-11-23 |
1352. | Joseph (trickyjogo) | 74.43 | 97% | 2020-11-06 |
1353. | Mohammad (casualboo) | 74.41 | 96% | 2019-06-13 |
1354. | Ali (bronzor16) | 74.40 | 94% | 2019-09-13 |
1355. | account deleted (concurrent) | 74.40 | 95% | 2020-03-15 |
1356. | Luke (ltuite) | 74.38 | 95% | 2019-03-12 |
1357. | Jeshwan (itsshade) | 74.31 | 97% | 2019-11-27 |
1358. | Todd (t0dd1337) | 74.31 | 95% | 2020-08-29 |
1359. | Go D. (deeated) | 74.29 | 96% | 2020-11-25 |
1360. | ap (nguyen4) | 74.28 | 96% | 2018-06-06 |
1361. | Christian (cott8161) | 74.28 | 96% | 2020-01-16 |
1362. | Josh (jtreadway) | 74.25 | 96% | 2018-08-14 |
1363. | Kyu (kyukang) | 74.21 | 95% | 2018-03-15 |
1364. | Grotesque (grotesquevinny) | 74.20 | 95% | 2020-02-15 |
1365. | Jake (jakesk) | 74.20 | 96% | 2020-08-24 |
1366. | Juan (unbilivavl) | 74.20 | 96% | 2020-08-24 |
1367. | Someone (someonetyping) | 74.17 | 98% | 2020-05-21 |
1368. | Noah (noah_o_n) | 74.15 | 95% | 2019-01-23 |
1369. | roy (likmyleg) | 74.15 | 97% | 2020-11-06 |
1370. | Zhivko (zikica97) | 74.12 | 97% | 2019-05-09 |
1371. | Sonny (sonson88) | 74.04 | 96% | 2017-10-07 |
1372. | Duduk (dudukmete) | 74.03 | 95% | 2019-01-06 |
1373. | FromtonRouge (fromtonrouge) | 74.01 | 98% | 2018-01-14 |
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 |