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Why viruses do not show characteristics until they enter the human body?
Viruses are non-cellular organisms that consist of a nucleic acid core (DNA or RNA) surrounded by a protein coat. They lack any membranes. Hence, they don't show living characteristics until they enter a living host or living cell to multiply.
The nucleic acid encodes the unique genetic information for each virus. The shape and size of viruses are determined by the amount and arrangement of the proteins and nucleic acid.
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