Biology · BIOLOGICAL CLASSIFICATION

Which rule strictly governs the nucleic acid genome constitution of viruses?

1. A
   Every single virus contains both double-stranded DNA and single-stranded RNA together
2. B
   Animal-infecting viruses exclusively contain single-stranded DNA and never RNA
3. C
   No virus contains both RNA and DNA; plant-infecting viruses generally have single-stranded RNA
4. D
   Bacteriophages universally possess single-stranded circular RNA enclosed in a chitin sheath