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(C) In many bacteria,the cell wall is covered with small,hair-like appendages known as $Pili$ and $Fimbriae$. $Pili$ are elongated,tubular structures

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Pili

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(C) In many bacteria,the cell wall is covered with small,hair-like appendages known as $Pili$ and $Fimbriae$. $Pili$ are elongated,tubular structures made of a special protein called $pilin$,which are primarily involved in bacterial conjugation. $Fimbriae$ are small,bristle-like fibers sprouting out of the cell,which help bacteria attach to rocks in streams and also to host tissues. $Flagella$ are longer,whip-like structures used for motility,while $Cilia$ are typically found in eukaryotic cells,not bacteria.

Many bacteria bear minute hairy structures on their cell wall,these are called

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