Viruses use their own catabolic enzymes , Viruses are unable to synthesize catabolic enzymes on their own to generate energy. They could only do so by expressing their genomes in the host cell's nucleus (for DNA viruses) or cytoplasm (for RNA viruses).
Viruses are metabolically inactive and must rely on cell metabolic activities to create component parts and replicate new viral copies. Often, the cell is dormant at the time of infection, but the infection alters the cell's metabolic activity.
Viruses cannot make or store adenosine triphosphate (ATP), so they must rely on the host cell for energy and all other metabolic processes
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