Arkansas Esthetician Practice Exam

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What is a sub-microscopic infectious agent that replicates only within cells of living hosts?

Bacteria
Protozoa
Virus
Fungus

The correct answer is: Virus

A virus is a sub-microscopic infectious agent that replicates only within cells of living hosts. Bacteria and protozoa are both single-celled organisms and do not require a host cell for replication. Fungus, while also single-celled, is not considered a virus as it can replicate and grow on its own. Therefore, the correct answer is C Virus.