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 |
---|---|---|---|---|
366. | lcrds (m4ck) | 99.24 | 98% | 2020-11-30 |
367. | Adam (shoelegend88) | 99.23 | 95% | 2018-10-16 |
368. | JeremyLoves (karenismywaifu) | 99.16 | 99% | 2019-05-01 |
369. | Moist (moisturemob) | 99.08 | 98% | 2018-03-20 |
370. | d (dc37) | 99.03 | 97% | 2017-12-17 |
371. | Cowcaine (gingfreecss2) | 99.02 | 98% | 2017-11-05 |
372. | Mark (mw126) | 98.98 | 97% | 2020-12-07 |
373. | 16/f/cali (ultrashibe) | 98.90 | 95% | 2018-08-11 |
374. | tstats[pumpkinsoup1] (pumpk... | 98.84 | 95% | 2020-12-19 |
375. | Harvey (sw99) | 98.78 | 98% | 2020-12-09 |
376. | Captain Oz (kildoes) | 98.69 | 95% | 2019-07-29 |
377. | (jasimk) | 98.67 | 98% | 2022-11-03 |
378. | Poops (poops_magee) | 98.60 | 97% | 2020-07-13 |
379. | JoX (jox997) | 98.56 | 99% | 2018-05-14 |
380. | Adrian (smithya) | 98.53 | 98% | 2018-06-10 |
381. | :) (bavadin) | 98.53 | 97% | 2020-11-22 |
382. | ratbastard (mattbierwirth) | 98.52 | 98% | 2018-01-06 |
383. | Calvin (taintedducky) | 98.39 | 96% | 2020-01-16 |
384. | napkin (call_me_napkin) | 98.36 | 97% | 2020-10-17 |
385. | kiki (aokiki) | 98.34 | 98% | 2019-06-25 |
386. | Jay (jay0005) | 98.27 | 97% | 2020-08-25 |
387. | Piggy (piggosu) | 98.23 | 99% | 2018-03-13 |
388. | polt (poltt) | 98.22 | 97% | 2020-11-19 |
389. | Mario (mariotusa) | 98.21 | 100% | 2018-01-05 |
390. | Alex (wu2481632) | 98.18 | 97% | 2019-01-07 |
391. | Leia (s_leia) | 98.18 | 97% | 2020-12-11 |
392. | Comeonn1 (comeonn1) | 98.15 | 98% | 2018-06-09 |
393. | 0x507FA88 (tt_richard) | 98.14 | 98% | 2019-02-08 |
394. | James (jamesz) | 98.00 | 97% | 2018-07-22 |
395. | Alex (gameahn) | 97.92 | 98% | 2017-10-21 |
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 |