Organelles such as nuclei and chloroplasts are not found in bacteria and were thought to disintegrate
However, researchers from the Bristol School of ScienceEarth were able to document the process of decay of eukaryotic algae cells: they showed that nuclei, chloroplasts and pyrenoids (organelles found in chloroplasts) can survive for weeks and months after cell death in eukaryotic cells.
The authors characterized the transformation of organelles into something resembling snot:
I spent several weeks taking photographsalgae cells as they disintegrated, and also checked the condition of the nuclei, chloroplasts and pyrenoids. From this we can conclude that these organelles do not disintegrate immediately after cell death, but in fact dissolve over many weeks.
Emily Carlisle, PhD student at the Bristol School of Geosciences
From a historical perspective, complex cell wallswere used to identify early eukaryotes. But some bacteria can reach large sizes, so cell wall decorations can disappear due to erosion
The study authors argue that they can prove complex life around 1,700 million years ago in order to clarify evolutionary history with greater precision and clarity.
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