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