Category
Cell Biology
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Not a fact anymore
Every eukaryotic organism retains mitochondria or a reduced version of them.
What we know now
Some single-celled eukaryotes have lost the mitochondrial organelle altogether. Monocercomonoides exilis survives without it, using a bacterial-derived system in the surrounding cell fluid to assemble essential iron–sulfur components of proteins.
- Status
- Overturned
- Category
- Cell Biology
- Accepted for
- Not quantified
- Changed approximately
- 2016, with further comparative evidence in 2023
Not a fact anymore
Cell membranes are static protein–lipid–protein sandwiches.
What we know now
Cell membranes are flexible double layers of lipid molecules with proteins embedded in or attached to them. The lipids and many proteins can move sideways within the membrane, and cells organize them into changing clusters and specialized regions.
- Status
- Superseded
- Category
- Cell Biology
- Accepted for
- ≈37 years
- Changed approximately
- 1960s–1972
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