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Viruses - Coggle Diagram
Viruses
Key Points
Viruses are tiny, non-cellular structures.
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Viruses are on the border between living and non-living. They are only living when inside a living host.
Viruses are made up of an outer protein coat called a capsid, inside the capsid is a nucleic acid either DNA or RNA never both.
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Viruses cannot replicate themselves, they multiply by using the energy and structures of a live host cell. For this reason they are said to be obligate parasites.
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A retrovirus is a type of virus that is made up of a protein coat, a nucleic acid (either DNA or RNA) and has an enzyme that can convert Viral RNA to DNA. e.g. HIV
Replication stages
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the hosts nucleic acid is made inactive, and the viral nucleic acid uses the hosts cell part machinery to make a more viral acid and proteins
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the host cell bursts, releasing the new viruses
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How to control a virus
general body defences like skin, mucus, stomach acid
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