Why Do Viruses Exist?

Viruses are extremely strange! They lack a nucleus (‘control center of the cell’), and are not considered to be alive. They still have genetic material, however, they lack the ribosomes required to synthesize proteins so they cannot reproduce on their own. So viruses are parasites, who need a host cell in order to replicate, and they ‘hijack’ a host cells, own machinery to do so!

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