Are surface appendages that allow a bacterium to stick to a surface.

Fimbriae

Explanation:

They are hair-like appendages around a bacteria (approximately 1,000 on average) and 3-10 nanometer in thickness. They are shorter as compared to flagella. They are therefore so small that they can only be visible using an electron microscope. The adhesin molecules within the fimbriae are significant in giving the structures their adhesiveness.

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