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(B) In prokaryotic cells,the flagella are the primary structures responsible for motility.$I -$ Pili are elongated tubular structures made of a specia

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(B) In prokaryotic cells,the flagella are the primary structures responsible for motility.$I -$ Pili are elongated tubular structures made of a special protein,primarily involved in conjugation (transfer of $DNA$).$II -$ Flagella are thin,filamentous extensions from the cell wall that act as propellers to provide motility to the bacteria.$III -$ Fimbriae are small bristle-like fibers sprouting out of the cell,which help in attaching bacteria to rocks in streams and also to the host tissues.Therefore,only the flagella are involved in motility.

Column $I$ (Filament)	Column $II$ (Structure $\&$ Function)
$(a)$ Microfilaments	$(i)$ Strong and fibrous proteins; provide support to filaments and tubules
$(b)$ Microtubules	$(ii)$ Actin proteins; responsible for cytoplasmic streaming
$(c)$ Intermediate filaments	$(iii)$ Globular tubulin proteins; responsible for chromosome movement

Which of the following structures are involved in motility?
$I -$ Pili,$II -$ Flagella,$III -$ Fimbriae

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Which of the following structures are involved in motility?$I -$ Pili,$II -$ Flagella,$III -$ Fimbriae