Final answer:
The arrangement you're referring to is known as amphitrichous, where bacteria have a flagellum or tufts of flagella at both ends of the cell. An example of this is Spirillum minor. It's different from monotrichous, lophotrichous, and peritrichous arrangements seen in other bacteria.
Step-by-step explanation:
The arrangement of flagella that results in flagella being located at either end of the cell is referred to as amphitrichous. In amphitrichous bacteria, such as Spirillum minor, which causes spirillary (Asian) rat-bite fever or sodoku, there is a flagellum or tufts of flagella situated at both ends of the cell. This is distinct from other flagellar arrangements, such as monotrichous where there is a single flagellum, lophotrichous with a tuft at one end, and peritrichous, where flagella cover the entire surface of a bacterial cell like in E. coli. Despite variations in arrangements, flagella and cilia in eukaryotic cells have a similar internal structure known as a "9 + 2 array," which consists of nine pairs of microtubules surrounding a central pair.