Viruses have __________.

Prokaryotic nucleus

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Single chromosome

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Both DNA and RNA

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DNA or RNA

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Solution

The correct option is D DNA or RNA
Viruses are sub-microscopic, infectious, nucleoprotein particles that can infect all living organisms.
A virus consists of genetic material either in the form of RNA or DNA surrounded by a protein coat.
Most of the viruses, infecting plants, have single-stranded RNA as genetic material.
On the other hand, the viruses infecting animals have single or double-stranded RNA or double-stranded DNA.
Thus, option D is correct here.

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