The Great Oxygenation

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# Cyanobacteria
- Responsible for The Great Oxygenation
- Responsible for [[The Great Oxygenation]]
- [[Spirulina]]: Highly nutritious
- [[Rivularia]]: Classifies as multi-cellular, as it can regrow its
photosynthetic filament
[//begin]: # "Autogenerated link references for markdown compatibility"
[The Great Oxygenation]: the-great-oxygenation "The Great Oxygenation"
[//end]: # "Autogenerated link references"

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# The Great Oxygenation
- The diverity of [[bacteria]] exploded during the [[Archaean]], leading to the
evolution of [[Cyanobacteria]]
- This does not mean that [[Spirulina]] existed during the [[Archaean]]: it
is a modern organism
- There was almost no O₂ in the atmosphere before the
[[Archaean]]-[[Proterozoic]] break
- No O₂ means no formation of peroxides
- Peroxides are dangerous to many cells as they rob electrons from
proteins, fatally altering them
- Cells had to develop anti-oxidation defenses, including [[catalase]]
- Cells had two ways to adapt to O₂
1. Become a strict anaerobe, and avoid oxygen-containing habitats
2. Tolerate O₂
- O₂ toleration can easily lead to aerobic metabolism
[//begin]: # "Autogenerated link references for markdown compatibility"
[bacteria]: bacteria "Bacteria"
[Archaean]: archaean "Archaean"
[Cyanobacteria]: cyanobacteria "Cyanobacteria"
[Proterozoic]: proterozoic "Proterozoic"
[//end]: # "Autogenerated link references"