Viruses are actually not cells at all they are parasites which have a non-cellular structure which is composed mainly of nucleic acid. Viruses lack ribosomes therefore they must use ribosomes from their host cells to interject RNA into viral proteins. All viruses can either contain DNA or RNA but they cannot have both. When living outside the cell a virus is known as a virion. Virions have at least one protein that is synthesized by specific genes in the nucleic acid.
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