What shape do bacilli bacteria have?

Bacilli bacteria are characterized by their rod-like shape. This cylindrical form allows them to efficiently divide and function in various environments. The rod shape can also influence the way bacilli interact with their surroundings, including their motility patterns and the way they form colonies. This morphology enables bacilli to thrive in diverse habitats, ranging from soil to water and within the bodies of animals.

The other shapes mentioned in the options refer to different categories of bacteria. Spiral-shaped bacteria are known as spirilla, while round bacteria are called cocci. Filamentous bacteria, on the other hand, have a thread-like structure. Each of these forms has distinct characteristics and modes of behavior, but it is the rod shape that specifically defines bacilli.