- Viruses are non cellular, obligate parasites. This means that viruses needs a host to survive; they cannot survive on their own.
- Viruses have an outer protein covering known as capsid and their own genetic material which can be RNA or DNA.
- They never contain both DNA and RNA.
- Their genetic material is what causes viral infections.
- Viruses can have different shapes such as helical, icosahedral, complex etc.
Examples of viral diseases:
- Viruses cause diseases like mumps, small pox, herpes and influenza.
- AIDS in humans is also caused by a virus.
- In plants, discoloration and mottling (formation og irregular patterns) is caused by the TMV (Tumor Mosaic Virus)
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