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 |
|---|---|---|---|---|
| 108. | (adma) | 117.40 | 96% | 2020-11-06 |
| 109. | Hawkyra (hawkyra) | 117.36 | 97% | 2019-06-23 |
| 110. | Chynna (chynnatown) | 117.32 | 98% | 2020-03-11 |
| 111. | Andrew (honeyman) | 117.20 | 99% | 2019-11-04 |
| 112. | Emma (emmapark) | 116.75 | 100% | 2017-12-03 |
| 113. | Laura (laura_palmer) | 116.68 | 100% | 2018-02-23 |
| 114. | Resync (resync) | 116.44 | 97% | 2019-10-23 |
| 115. | boeien (ebic_gamer) | 116.22 | 97% | 2020-03-09 |
| 116. | Justin (dunklioscious) | 115.96 | 97% | 2020-11-06 |
| 117. | Jerne (ahelia) | 115.89 | 98% | 2019-07-12 |
| 118. | beat me if u can ; (bblaise) | 115.86 | 99% | 2017-11-10 |
| 119. | (daniel598) | 115.86 | 98% | 2017-10-07 |
| 120. | twitch.tv/frazwah (frazwah) | 115.74 | 97% | 2018-05-11 |
| 121. | Leeh (leeh2002) | 115.52 | 98% | 2019-04-13 |
| 122. | top 10 quitter fosho (josasim) | 115.14 | 96% | 2020-06-18 |
| 123. | Mike (emrenegades) | 115.01 | 98% | 2018-02-15 |
| 124. | andy (andytixn) | 114.87 | 97% | 2020-06-27 |
| 125. | Christian (krisco) | 114.50 | 99% | 2018-12-06 |
| 126. | Streender (streender) | 114.50 | 97% | 2020-01-02 |
| 127. | snails (hovermind) | 114.22 | 99% | 2020-06-12 |
| 128. | Aaron (aaronadams1) | 114.20 | 99% | 2018-08-24 |
| 129. | Mia (lkortebe) | 114.01 | 98% | 2019-01-24 |
| 130. | x (mxlxdx) | 113.87 | 99% | 2019-04-30 |
| 131. | Eli (eli_ayase) | 113.86 | 96% | 2020-11-04 |
| 132. | Ahmad (slayman19) | 113.80 | 97% | 2020-03-14 |
| 133. | Rude (rudedawg) | 113.77 | 98% | 2019-09-17 |
| 134. | Kelo (xkelo) | 113.75 | 97% | 2019-08-07 |
| 135. | Hi (excetra) | 113.58 | 96% | 2020-01-11 |
| 136. | (jlachney) | 113.48 | 98% | 2018-02-09 |
| 137. | Benji (bmhowie2011) | 113.39 | 98% | 2018-07-22 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | 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 |