Eli5: what exactly is a virus and are viruses alive?
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Simply put its like a little case made of proteins that contains DNA or RNA (if you don’t know what RNA is think of it like simpler dna cut in half so there’s on on strand)
Virus will enter a cell and inject their DNA/RNA into the nucleus of the cell (think of it like a control centre where the cells DNA is normally reproduced). The virus pretty much forces the cell to use the DNA/RNA it gave it and replicate that, creating more of the virus instead of using its own dna to make more cells.
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