- These are particles, rather than cells, and are smaller than bacteria
- They can only reproduce inside living cells. A virus is an example of a parasite- it depends on another organism to grow and reproduce
- They infect all types of living organisms
- They come in loads of different shapes and sizes
-They don't have a cellular structure- they have a protein coat around some genetic material (either DNA or RNA)
Examples:
- influenza virus
-Tobacco mosaic virus- this makes the leaves of tobacco plants discoloured by stopping them from producing chloroplasts
-HIV
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