The component of a virus which is injected into a cell is nucleic acid because these are the building blocks of genetic material such as DNA or RNA.
What do you mean by Virus?
A Virus may be defined as an infectious agent that can only duplicate its copy inside a host organism.
Nucleic acids are responsible for the synthesizing of genetic material which gives all the information associated with genes and gene products.
Therefore, the component of a virus which is injected into a cell is the nucleic acid.
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