Colorado Esthetician Written Practice Exam

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What is the shape of Bacilli bacteria?

Rod-shaped
Spiral-shaped
Spherical
Corkscrew-shaped

The correct answer is: Rod-shaped

Bacilli bacteria are rod-shaped, which is known as bacillus or bacilli singular. This shape is characterized by bacteria being elongated and cylindrical, resembling a rod or a cylinder. Rod-shaped bacteria like Bacilli can exist singly or in chains and are important to identify for proper diagnosis and treatment of bacterial infections. Spiral-shaped bacteria are known as spirilla, spherical bacteria are known as cocci, and corkscrew-shaped bacteria are known as spirochetes.