What term describes corkscrew-shaped bacterial cells?

The term that describes corkscrew-shaped bacterial cells is "spirilla." Spirilla are a category of bacteria characterized by their spiral or corkscrew shape, which allows them to move in a unique manner through different environments. This shape can be particularly advantageous for motility and navigating through viscous liquids or other challenging environments.

In contrast, bacilli refer to rod-shaped bacteria, while staphylococci and streptococci are terms that describe spherical bacteria. Specifically, staphylococci are clusters of spherical bacteria resembling grapes, and streptococci are chains of spherical bacteria. These distinct morphological characteristics help in the classification and identification of various types of bacteria in microbiology.