PSI Cosmetology Practice Exam

Which is an example of a parasite?

1. Fungus

2. Scabies

3. Bacteria

4. Virus

The correct answer is: Scabies

Scabies is indeed an example of a parasite. It is caused by the Sarcoptes scabiei mite, which burrows into the skin and feeds on the host's skin cells. This parasitic behavior leads to irritation, itching, and inflammation, which are characteristic of a scabies infection. Parasites, such as scabies, rely on a host for survival and reproduction, often causing harm to the host in the process. This distinguishes them from other types of microorganisms, such as bacteria, viruses, and fungi, which may not always function as parasites. Bacteria can be either beneficial or harmful, viruses require a host to replicate but typically do not undertake the same feeding or living behaviors as parasites, and fungi can often be either saprophytic or pathogenic but do not fall under the same category as parasitic organisms. Understanding these distinctions helps clarify why scabies represents a clear example of a parasitic infection, emphasizing the relationship between the parasite and its host.