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 panicles. Genetic material of viruses are either DNA or RNA but not both. Viruses consist of outer capsid of protein and central nucleic acid core, eg, HIV virus, tobacco mosaic virus etc.
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