Colorado Cosmetology Written Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

The correct answer is "Diplococci," as this term specifically refers to bacteria that occur in pairs. Diplococci are a type of cocci, which are spherical-shaped bacteria, and when they reproduce by dividing in one plane, they create pairs. This is significant because certain species of diplococci, such as Streptococcus pneumoniae, are known to cause pneumonia.

Bacilli refers to rod-shaped bacteria, which have a different morphology and are not known for forming pairs. Cocci encompasses all spherical bacteria and does not specify the arrangement, so it includes both individual cocci and those that cluster in different formations. Spirilla are spiral-shaped bacteria, unrelated to the paired arrangement that diplococci exhibit.

Understanding the specific classifications of bacteria is crucial in fields like cosmetology where hygiene and infection prevention are key components of practice. Recognizing the characteristics and implications of different types of bacteria helps professionals maintain a safe environment for their clients.