Colorado Cosmetology Written Practice Exam

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What type of bacteria are round-shaped and can be either alone or grouped?

Bacilli
Cocci
Spirilla
Vibrios

The correct answer is: Bacilli

The correct answer is connected to the term "Cocci," which describes bacteria that are round-shaped. Cocci can exist as single cells or in clusters, pairs, or chains, depending on the species and environmental conditions. This characteristic is key in identifying them under a microscope or in bacterial cultures. When considering other types like bacilli, these are rod-shaped bacteria, while spirilla are spiral-shaped, and vibrios are comma-shaped. Each of these categories has distinct forms that differentiate them from cocci. Understanding the shapes and groupings of bacteria is important in microbiology and can influence clinical identification and treatment decisions.