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→About Viruses
==Key Stage 4==
[[File:VirusClipart.png|right|300px|thumb|A clipart image of a [[virus]].]]
===Meaning===
A [[virus]] is a type [[pathogen]] that can [[Infection|infect]] individual [[Cell (Biology)|cells]] in an [[organism]].
===About Viruses===
: '''Viruses''' are made from a strand of [[DNA]] or [[RNA]] and a [[Protein Sheath|protein sheath]].
: '''Viruses''' cannot reproduce outside a [[host]] [[Cell (Biology)|cell]] so they are not considered to be [[alive]].
: When a '''virus''' comes in contact with a target [[Cell (Biology)|cell]] it attaches itself to the [[Cell Membrane|cell membrane]] and then injects its [[DNA]] (or [[RNA]]) into the [[Cell (Biology)|cell]]. Once this is done the [[DNA]] causes the [[Cell (Biology)|cell]] to start making copies of the [[virus]]. When millions of copies have been made they burst out, killing the [[Cell (Biology)|cell]]. These millions of [[virus]]es can then go on to [[infection|infect]] other [[Cell (Biology)|cells]].
: [[HIV]] causes a [[disease]] called [[AIDS]] which has the symptoms of a weakened [[Immune System|immune system]] which leads to other [[infection]]s.
: [[Tobacco Mosaic Virus]] is a [[virus]] which causes Tomato Plants and Tobacco Plants to grow slowly.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f601 ''Virus, pages 129, 138-41, 300, 304, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Viruses, pages 124, 126, GCSE Combined Science Trilogy; Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Viruses, pages 130, 132, GCSE Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10404 ''Viruses, pages 42, 44, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Viruses, pages 46, 47, GCSE Biology; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Viruses, pages 76-77, 84-85, 115, GCSE Biology; Third Edition, Oxford University Press, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Viruses, pages 153, 155-159, GCSE Biology, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Viruses, pages 39, 40, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Viruses, pages 55, 56, GCSE Biology; The Revision Guide, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Viruses, pages 87, 103, GCSE Biology, Pearson, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Viruses; life cycle, pages 106-107, GCSE Biology, Pearson, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Viruses; vectors for, pages 195, GCSE Biology, Pearson, Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Viruses, pages 24-25, 209, 211, 215-216, 221, Gateway GCSE Biology, Oxford, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Viruses, pages 67, 68, 72, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Viruses, pages 91, 92, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=oqGuJhOeMek}}