Flagella

Motility is a defining feature of many cells, and this section covers the whip-like structures that make it possible: flagella. Crucially, prokaryotic flagella and eukaryotic flagella are not simply smaller and larger versions of the same structure - they are built from entirely different materials and driven by entirely different sources of energy, and the chapter treats them as two genuinely separate topics before finishing with the shorter, more numerous eukary …