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Bacteria are prokaryotic cells. Simple in structure, they may have both pili and flagella. The flagella are used for movement, but the pili have many functions: adhesion, reproduction, and movement as well. The flagella and pili are similar in that they are both composed of

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The flagella and pili are similar in that they are both composed of proteins. Flagella is made up of protein flagellin, while pili is composed of protein pilin. Both flagella and pili are tubular hollow, filamentous structures of bacteria. Both extend from the surface of the bacterial wall.

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