CAIE A-Level Biology A2 18.1.6 Virus Classification Questions

Viruses sit outside the three-domain system and are classified using their nucleic acid. Questions first distinguish DNA from RNA and single-stranded from double-stranded genomes, then may ask for further characteristics such as genome form, messenger-RNA production, envelopes, capsids or associated diseases.

Exam points

Classify viruses by whether their nucleic acid is DNA or RNA and whether it is single-stranded or double-stranded.
Use additional classification characteristics when supplied, such as how messenger RNA is produced, whether the genome is linear or circular, envelope presence, capsid shape or associated disease.

[Maximum number: 2]

Viruses are not included in the three domain classification.
Outline how viruses are classified.

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CAIE A-Level Biology A2 18.1.6 Virus Classification Questions question 1