Comparison of Bacteria and Viruses

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Differences between Bacteria and Viruses Bacteria

Viruses

- Bacteria are small unicellular organisms,

- Viruses are non-cellular and even smaller

much smaller than animal and plant cells

than bacteria

- Some bacteria cause disease but most are

- They cause disease in every living

harmless and we use them to make food and

organism from humans to bacteria

medicine and to treat sewage - Viruses take over the cells in the body. - Once inside your body, they split in two to

They cannot reproduce outside of a ‘host’

reproduce

cell

- They usually release toxins to affect your

- They damage and destroy cells

body although sometimes they directly damage your cells - Bacteria can double their population in 20 minutes -Relatively easy to cure with antibiotics - Has ribosomes - DNA and RNA in cytoplasm with cell wall and cell membrane - No nucleus

- They very rarely release toxins - Very hard to cure – cure – vaccines can only prevent the spread of viruses - No ribosomes - DNA or RNA in a ‘coat’ of protein  protein  - No nucleus - Largely un-beneficial but a particular type of virus may be able to destroy brain tumours and they can be useful in genetic engineering

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