What shape are bacilli, a type of bacteria?

Bacilli are characterized by their elongated, cylindrical shape, resembling rods. This distinct morphology is crucial not only for their classification within the bacterial kingdom but also influences their behavior, reproduction, and the types of infections they may cause. Understanding this shape is essential for anyone studying microbiology or cosmetology, as the presence of different types of bacteria can have a significant impact on skin health and hygiene practices.

The other options present shapes that correspond to different types of bacteria; for instance, spirilla are spiral-shaped, while cocci are round. The mention of square is not relevant in bacterial classification, as no known bacteria have a truly square shape. This understanding lays the groundwork for recognizing the diverse forms of bacteria and their implications in the beauty and health industries.