Texas Esthetician License Practice Exam

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What is the most common type of bacteria?

Cocci
Bacilli
Spirilla
Fungi

The correct answer is: Bacilli

The most common type of bacteria is bacilli, which are rod-shaped and can be found in various environments. Bacilli can be classified into two main types: pathogenic, which can cause diseases, and non-pathogenic, which play essential roles in ecological processes and human health, such as those involved in fermentation and digestion. This shape allows them to grow in colonies, which contributes to their prevalence in many environments, including soil, water, and living organisms. Cocci are spherical bacteria, while spirilla are spiral-shaped. Although cocci and spirilla are also common, bacilli represent a broader and particularly versatile group in terms of prevalence and functionality. Fungi, while a significant part of the microbial world, are not classified as bacteria, which is why it does not fit into the comparison regarding types of bacteria.