Viruses are classified on the basis of:
Correct answer: B. Structure and nucleic acid
- A. Color and size only
- B. Structure and nucleic acid
- C. Habitat only
- D. Temperature tolerance
Explanation
Viruses are classified mainly on their structure, such as capsid shape and the presence of an envelope, and on the type of nucleic acid they carry, DNA or RNA. Colour, habitat and temperature tolerance are not meaningful for particles that are inert outside a host cell.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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