Which cell shape is characterized by a spherical form?

The coccus is characterized by its spherical shape, which can exist as single cells or in clusters, chains, or other arrangements depending on the species. This shape is one of the most recognized in microbiology and is significant for identification and classification of bacteria.

Cocci can be observed under a microscope as round, ball-like cells, and their arrangement can affect their naming, such as diplococci (pairs) or streptococci (chains). This spherical form is essential in the differentiation of bacteria, especially in clinical settings for diagnosis and treatment of bacterial infections.

In contrast, the other options indicate different shapes: rod-shaped bacteria are referred to as bacilli, spirilla have a spiral shape, and vibrios are comma-shaped. Understanding these distinctions is vital in microbiology for recognizing and categorizing various types of bacteria based on their morphological characteristics.