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 |
---|---|---|---|---|
123. | Aaron (aaronadams1) | 114.20 | 99% | 2018-08-24 |
124. | Mia (lkortebe) | 114.01 | 98% | 2019-01-24 |
125. | x (mxlxdx) | 113.87 | 99% | 2019-04-30 |
126. | Eli (eli_ayase) | 113.86 | 96% | 2020-11-04 |
127. | Ahmad (slayman19) | 113.80 | 97% | 2020-03-14 |
128. | Rude (rudedawg) | 113.77 | 98% | 2019-09-17 |
129. | Kelo (xkelo) | 113.75 | 97% | 2019-08-07 |
130. | exc (excetra) | 113.58 | 96% | 2020-01-11 |
131. | Jon (jlachney) | 113.48 | 98% | 2018-02-09 |
132. | Benji (bmhowie2011) | 113.39 | 98% | 2018-07-22 |
133. | pangea (pangeacake) | 113.37 | 98% | 2018-12-06 |
134. | Dylan (dr_gammaray) | 113.28 | 98% | 2019-10-31 |
135. | Kevin (ashret) | 113.25 | 98% | 2019-04-15 |
136. | dva main (thedragonemperor) | 113.25 | 97% | 2020-12-11 |
137. | Hailey (haileymeng) | 112.52 | 98% | 2019-01-07 |
138. | Pakalu (transfusion) | 112.48 | 98% | 2020-09-02 |
139. | Sam (samowens) | 112.44 | 97% | 2018-12-01 |
140. | Alfredo 🎉 (zalfredo) | 112.42 | 99% | 2018-06-16 |
141. | Romo (drytoast) | 112.29 | 99% | 2020-01-04 |
142. | ✔️▄◘🚀!new_luca@y... | 112.22 | 99% | 2020-09-20 |
143. | Veklion (veklion) | 112.05 | 98% | 2020-02-15 |
144. | ⭐️⭐️⭐️ (pbnl2) | 111.93 | 99% | 2020-01-10 |
145. | Zach (zachattack973) | 111.91 | 98% | 2020-02-11 |
146. | marvin (magnimarve) | 111.81 | 97% | 2018-10-13 |
147. | KC (__kc__) | 111.79 | 99% | 2019-02-04 |
148. | akelok (akelok) | 111.70 | 97% | 2019-07-12 |
149. | Jonathan (blubernugets) | 111.70 | 98% | 2019-04-25 |
150. | jse (dragoncityjose) | 111.64 | 96% | 2020-11-07 |
151. | jchan18 (jchan18) | 111.53 | 98% | 2020-07-01 |
152. | - (ndca) | 111.52 | 99% | 2023-03-12 |
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 |