Multiple Choice
Which of the following is most likely to be present on the surface of a skin epithelial cell that has been infected by a virus?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
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Which of the following best describes a viroid?
A
A small, circular RNA molecule that infects plants and lacks a protein coat
B
A lipid-enveloped virus that infects human cells
C
A DNA virus that infects bacteria
D
A proteinaceous infectious particle that causes neurodegenerative diseases in animals
Verified step by step guidance1
Understand that the question asks for the best description of a viroid, which is a specific type of infectious agent.
Recall that viroids are unique because they consist solely of a small, circular RNA molecule without any protein coat, distinguishing them from viruses.
Recognize that viroids primarily infect plants, causing various plant diseases, unlike viruses that can infect animals or bacteria.
Compare the given options to identify which one matches the characteristics of viroids: small, circular RNA, no protein coat, and plant infection.
Eliminate options describing lipid-enveloped viruses, DNA viruses infecting bacteria, or proteinaceous infectious particles (prions), as these do not fit the definition of viroids.
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