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 |
---|---|---|---|---|
1101. | Jess (switi_pits) | 78.90 | 97% | 2019-08-23 |
1102. | Khoi (khoitran) | 78.88 | 98% | 2020-08-25 |
1103. | Devids (theneo) | 78.87 | 98% | 2020-05-12 |
1104. | Trevor (nutt69) | 78.86 | 96% | 2019-02-15 |
1105. | Andre (smallchicken) | 78.85 | 97% | 2017-11-01 |
1106. | Despacito (mathaddict314) | 78.85 | 96% | 2018-11-28 |
1107. | Salman (blackstrobe) | 78.84 | 96% | 2019-04-18 |
1108. | HiroHero (hirohero89) | 78.78 | 98% | 2020-11-25 |
1109. | OneTree (onetreeinaforest) | 78.76 | 97% | 2019-03-19 |
1110. | trigunateet (trigunateet15) | 78.75 | 98% | 2018-01-19 |
1111. | Dvorak (mesingel_dvorak) | 78.74 | 98% | 2020-11-14 |
1112. | MINH (shinmyou) | 78.71 | 98% | 2020-03-20 |
1113. | FlyingButter (flyingbutter0) | 78.71 | 96% | 2020-08-09 |
1114. | |𝐅𝐄𝐑|SiriusB (bsir... | 78.69 | 95% | 2017-10-07 |
1115. | Eugene (eugeneteoh) | 78.67 | 97% | 2020-11-04 |
1116. | John (thugger) | 78.67 | 97% | 2019-11-05 |
1117. | Broken (brokencog) | 78.66 | 98% | 2018-06-21 |
1118. | RIley (rileygrotenhuis) | 78.66 | 96% | 2019-05-07 |
1119. | John (typist426) | 78.63 | 98% | 2017-11-30 |
1120. | Sam (sam889) | 78.63 | 97% | 2019-06-23 |
1121. | 230V A/C Single Phase (obidi) | 78.59 | 97% | 2019-11-24 |
1122. | AdilDSW (adildsw) | 78.57 | 97% | 2017-11-27 |
1123. | Paolo (invelt) | 78.57 | 95% | 2019-10-02 |
1124. | Jose (josethomas) | 78.54 | 99% | 2019-06-14 |
1125. | Daryl (t3kk3rs) | 78.54 | 96% | 2020-01-13 |
1126. | Ed (pelly1863) | 78.52 | 97% | 2018-01-11 |
1127. | Johnny (boneritis) | 78.50 | 99% | 2018-09-27 |
1128. | Lucario387 (tung1x45) | 78.47 | 94% | 2019-06-09 |
1129. | Marc (truthdoc) | 78.44 | 96% | 2017-10-23 |
1130. | galei (galei) | 78.44 | 97% | 2020-08-14 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | October 7, 2017 |
Instant Death Mode | 3 | 99.10 | January 10, 2019 |
All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
New English Texts | 1 | 108.31 | May 26, 2022 |