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File - Once Upon A Cell
File - Once Upon A Cell

... 17. Study the diagram and the statement above. Michelle is observing cell division in an onion cell, but this type of cell division also occurs in the human body. Which statement is not true about this type of cell division in humans? a. This type of cell division is humans produces sex cells as wel ...
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Symbiogenesis



Symbiogenesis, or endosymbiotic theory, is an evolutionary theory that explains the origin of eukaryotic cells from prokaryotes. It states that several key organelles of eukaryotes originated as a symbiosis between separate single-celled organisms. According to this theory, mitochondria, plastids (for example chloroplasts), and possibly other organelles representing formerly free-living bacteria were taken inside another cell as an endosymbiont around 1.5 billion years ago. Molecular and biochemical evidence suggest that mitochondria developed from proteobacteria (in particular, Rickettsiales, the SAR11 clade, or close relatives) and chloroplasts from cyanobacteria (in particular, nitrogen-fixing filamentous cyanobacteria).
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