Which of the following are non-cellular infectious agents?
A
Protozoa
B
Fungi
C
Bacteria
D
Viruses
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1
Understand the definition of non-cellular infectious agents: These are infectious entities that do not have a cellular structure. They rely on the host's cellular machinery for replication.
Review the characteristics of viruses: Viruses are composed of genetic material (DNA or RNA) enclosed in a protein coat. They lack cellular structures and cannot reproduce independently outside a host cell.
Differentiate between cellular and non-cellular organisms: Protozoa, fungi, and bacteria are cellular organisms, meaning they have a cell structure and can reproduce independently.
Identify viruses as non-cellular: Since viruses do not have a cellular structure and require a host to replicate, they are classified as non-cellular infectious agents.
Conclude that among the given options, viruses are the only non-cellular infectious agents, as protozoa, fungi, and bacteria are all cellular.