Michigan Esthetician State Board Practice Exam

What is the definition of a virus?

1. A type of bacteria

2. A large infectious microorganism

3. A parasitic particle that infects host cells

4. A form of fungi that causes disease

The correct answer is: A parasitic particle that infects host cells

The definition of a virus as a parasitic particle that infects host cells is accurate because viruses cannot reproduce or carry out metabolic processes on their own. They rely on the cellular machinery of a host organism to replicate and spread. This dependence on host cells distinguishes viruses from living organisms and highlights their nature as obligate parasites. Understanding this definition is crucial for estheticians, as many skin disorders and infections can stem from viral agents, making it important to recognize the role of viruses in various conditions. This knowledge helps practitioners provide appropriate treatments and maintain a safe environment for clients. The other choices encompass inaccuracies: bacteria are prokaryotic cells and differ significantly from viruses in structure and function; large infectious microorganisms could refer to other pathogens but do not specifically describe viruses; and fungi are distinct organisms altogether, falling into a different category based on their characteristics and life processes.