Find the mismatched pair related to prokaryotes from the following:
Cell wall - structural support
Pili - bristle-like fibres
Filament - the longest portion and extends from the cell surface to the outside
Inclusion bodies - storage of reserve material
Pili and Fimbriae are surface features of bacteria that, like flagella, serve no function in locomotion. Pili are elongated tubular structures composed of a unique protein. Hence option (2) is correct.