The structure which a virus have in common with a prokaryotic cell is: nucleic acid.
A prokaryote can be defined as a unicellular organism which is typically characterized by a cell that is devoid (lacking) of a well-defined cell organelle such as a nucleus.
Unlike eukaryote, a prokaryote doesn't have a well-defined, membrane-bound nucleus but has a nucleoid instead.
A nucleoid refers to an irregularly-shaped portion inside the cell of a prokaryote where all or most of its genetic materials are located such as nucleic acid.
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