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 |
---|---|---|---|---|
1060. | Angelic (angelic_devil) | 79.73 | 96% | 2020-11-06 |
1061. | typer (carpeltypist) | 79.69 | 96% | 2020-12-01 |
1062. | powerpunch is noob (overdosed) | 79.68 | 96% | 2020-11-30 |
1063. | Marc (randyrandall) | 79.67 | 97% | 2018-04-06 |
1064. | Elia (ganmen) | 79.67 | 99% | 2020-07-03 |
1065. | script/script (henville12) | 79.66 | 96% | 2020-05-16 |
1066. | joniboi (joniboi) | 79.63 | 95% | 2018-02-16 |
1067. | josh (joshbuggy) | 79.58 | 96% | 2020-05-26 |
1068. | Ryan (rlee023) | 79.58 | 98% | 2020-08-28 |
1069. | Nick (nicklong1599) | 79.56 | 97% | 2018-08-21 |
1070. | Rearia (rearia) | 79.54 | 94% | 2018-07-10 |
1071. | Aven (avenue3) | 79.49 | 95% | 2020-06-14 |
1072. | :O (andrewhl01) | 79.47 | 96% | 2018-11-07 |
1073. | Snader (mrsander) | 79.47 | 93% | 2020-10-14 |
1074. | fnrslvr (fnrslvr) | 79.45 | 98% | 2018-09-24 |
1075. | Smol (smol_potot) | 79.45 | 98% | 2018-11-04 |
1076. | ALCIONE (gel4ever) | 79.43 | 97% | 2020-02-10 |
1077. | Isaias (mindblowers) | 79.43 | 97% | 2018-09-25 |
1078. | Noggie (noggie) | 79.41 | 97% | 2020-04-28 |
1079. | Gary (garrigan) | 79.37 | 97% | 2018-12-20 |
1080. | Jizz (mamski) | 79.31 | 97% | 2018-01-12 |
1081. | Ruby (rhubarbo) | 79.31 | 98% | 2018-06-09 |
1082. | Simon (jangjun0901) | 79.29 | 96% | 2019-05-23 |
1083. | Tom (stacked_dude) | 79.20 | 97% | 2019-01-26 |
1084. | Jimmy (jx297) | 79.18 | 99% | 2018-02-01 |
1085. | J (coughee) | 79.17 | 97% | 2018-06-13 |
1086. | Josh (j2k__) | 79.17 | 97% | 2019-01-26 |
1087. | Peter (shortty10) | 79.17 | 95% | 2018-09-08 |
1088. | Dog acc (vick02) | 79.17 | 96% | 2020-05-16 |
1089. | dean (aydeano) | 79.17 | 96% | 2020-11-26 |
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 |