A) DNA only
B) nucleic acid, DNA or RNA
C) protein only
D) nucleic acid and protein
Correct Answer: D
Solution :
Viruses are connecting link between living and non-living. These are of nucleoprotein particles. Genetic material of viruses is either DNA or RNA but not both- Viruses consist of outer consist of protein and central nucleic acid core, e.g., HIV virus, tobacco mosaic virus etc.
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