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Fimbriae and flagella are both filamentous proteinaceous structures found on the surface of some bacterial cells, but they have different functions and structures. Fimbriae are bristle-like short fibers that occur on the surface of some Gram-positive and Gram-negative bacteria. Their main function is surface attachment, which enables the bacterial cell to stick to the surface of host cells. They also help in the formation of pellicles or biofilms.
Flagella, on the other hand, are long whip-like filamentous structures present in some bacteria. The most important function of flagella is to assist in locomotion. Flagella can also act as a sensory organ to detect temperature and the presence of certain chemicals in the external environment of the cell.
In summary, fimbriae are used for attachment while flagella are used for movement.