PSI Barbering Practice Exam

Which type of bacteria are typically non-motile and spread through air or dust?

1. Streptococci

2. Viruses

3. Bacilli

4. Mycobacteria

The correct answer is: Viruses

In this context, the correct answer focuses on the nature of bacteria and their movement. Streptococci, as a type of bacteria, are generally non-motile and can spread through air or dust, particularly when forms like respiratory droplets are involved. They are known for causing illnesses such as strep throat. Viruses, while also capable of spreading through air or dust, do not fall under the category of bacteria as they are entirely different entities that reproduce differently and require a living host. Bacilli refer to rod-shaped bacteria that may be motile or non-motile depending on the species and typically do not spread primarily through air or dust. Mycobacteria, which include the bacteria responsible for tuberculosis, are non-motile but are also specific and do not have widespread dispersal characteristics like streptococci do. Understanding the differences among these microorganisms is crucial, especially regarding how infections can spread and the necessary precautions in a barbering or salon environment.