Cells and Living processes

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Flagella (Undulipodia)


First seen under a light microscope

Some bacteria have flagella and these look like EUKARYOTIC UNDULIPODIA,but their INTERNAL STRUCTURE is very different.

In EUKARYOTES (organisms that have cells with nuclei)


  • Unduliphodia and Cilia are structually the same  however, Undulipodia are LONGER than cilia . (Cilia are short- around 10 micrometres long)
  • Unduliphodia usually occur in ones or twos in a cell, whereas cilia often occur in large numbers on a cell
  • Hair-like extensions that stick out from the surface of cells.
  • each- made up of a cylinde that contains NINE MICROTUBLULES ARRANGED IN A CIRCLE
  • There are also TWO MICROTUBULES in a central bundle

UNDIPODIUM that forms the tail of a sperm, can move a whole cell.

UNDIPODIUM AND CILIA can move because the microtubules can use energy from ATP made in respiration

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