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For Edexcel GCSE Biology you need to know the details of three specific viral diseases: HIV, tobacco mosaic virus (TMV), and measles. You also need to understand why viral diseases are difficult to treat.
Viruses are not true living cells. They are tiny particles consisting of a piece of genetic material (DNA or RNA) surrounded by a protein coat (capsid). Some viruses also have a lipid envelope.
How they work:
This destruction of host cells causes the symptoms of viral disease.
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