Which of the following is a fact that argues against a symbiotic origin of eukaryotic flagella from bacterial flagella?
1
Bacterial flagella typically contain flagellin; eukaryotic flagella contain tubulin.
2
Bacterial flagella rotate; eukaryotic flagella do not rotate.
3
Bacterial flagella are directly energized by electrons and protons from the respiratory system of the plasma membrane; eukaryotes are not.
4
More than one of the above argue against the symbiotic theory.