Washington Esthetician State Board Practice Exam

Which bacteria are known for their spiral shape?

1. Staphylococci

2. Spirilla

3. Bacilli

4. Cocci

The correct answer is: Spirilla

Spirilla are the type of bacteria that are characterized by their spiral shape. This distinct morphology allows them to move with a corkscrew motion, which is facilitated by their flagella. This movement is important for their survival and ability to inhabit various environments. In contrast, the other types of bacteria listed have different shapes and characteristics. Staphylococci are spherical bacteria that tend to cluster in groups resembling grapes. Bacilli are rod-shaped bacteria, and cocci are also spherical but typically appear in pairs or chains. Understanding these shapes is crucial for identification and treatment in a clinical setting, as different shapes often correspond to different behaviors, pathogenicity, and treatment approaches.