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A virus has no ribosomes, water molecules or cell membrane. It cannot build any proteins itself, so it is not a living thing, but it does contain a chromosome which it can inject into a living cell.
When a cell is infected, the virus's genes are taken into the cell's chromosome, where they begin to give out messages for making new viruses. The cell is turned into a factory for making copies of the virus.  When it is full of viruses the cell bursts open, sending out millions of viruses to infect more cells.
See also Viral Diseases
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Useful Links |
Biological Environment > Viruses
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Note: Many facts have been simplified to make them easier to understand.
Click here to read Time Crystal, history of the Universe as sci-fi fantasy romance!
