Virus

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A virus is a non-living [[Obligate|obligate]] [[Intracellular|intracellular]] [[Parasite|parasite]]. They can only replicate inside of a living [[Cell|cell]] as they lack the necessary [[Enzymes|enzymes]] and molecular building blocks to be self sufficient. Viruses can be classified by structure (icosahedral, enveloped, complex etc), [[Genome|genome]] ([[Retroviruses|retroviruses]] have an [[RNA|RNA]] genome) or by the route through transcription (Baltimore classification).  
 
A virus is a non-living [[Obligate|obligate]] [[Intracellular|intracellular]] [[Parasite|parasite]]. They can only replicate inside of a living [[Cell|cell]] as they lack the necessary [[Enzymes|enzymes]] and molecular building blocks to be self sufficient. Viruses can be classified by structure (icosahedral, enveloped, complex etc), [[Genome|genome]] ([[Retroviruses|retroviruses]] have an [[RNA|RNA]] genome) or by the route through transcription (Baltimore classification).  
  
They have a large [[Glycoprotein|protein]] coat, called a capsid, which is formed from many repeating protein subunits which join non-covalently to produce a large icosahedron sphere. Inside this sphere is where the virus' free [[Nucleic_acid|nucleic acid]]s are kept. The structure of this sphere is such that is protects the [[Nucleic_acid|nucleic acid]] but also allows the [[Nucleic_acid|nucleic acid]] to exit so it can go on to infect other cells<ref>Alberts, B. Johnson, A. Lewis, J. Raff, M. Roberts, K. Walter, P. (2008) Molecular Biology Of The Cell.  Fifth Edition, New York:Garland Science(148-149)</ref>.
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They have a large [[Glycoprotein|protein]] coat, called a capsid, which is formed from many repeating protein subunits which join non-covalently to produce a large icosahedron sphere. Inside this sphere is where the virus' free [[Nucleic acid|nucleic acids]] are kept. The structure of this sphere is such that is protects the [[Nucleic acid|nucleic acid]] but also allows the [[Nucleic acid|nucleic acid]] to exit so it can go on to infect other cells<ref>Alberts, B. Johnson, A. Lewis, J. Raff, M. Roberts, K. Walter, P. (2008) Molecular Biology Of The Cell.  Fifth Edition, New York:Garland Science(148-149)</ref>.  
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=== References ===
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=== <references /> ===

Revision as of 14:24, 24 October 2013

A virus is a non-living obligate intracellular parasite. They can only replicate inside of a living cell as they lack the necessary enzymes and molecular building blocks to be self sufficient. Viruses can be classified by structure (icosahedral, enveloped, complex etc), genome (retroviruses have an RNA genome) or by the route through transcription (Baltimore classification).

They have a large protein coat, called a capsid, which is formed from many repeating protein subunits which join non-covalently to produce a large icosahedron sphere. Inside this sphere is where the virus' free nucleic acids are kept. The structure of this sphere is such that is protects the nucleic acid but also allows the nucleic acid to exit so it can go on to infect other cells[1].

References

  1. Alberts, B. Johnson, A. Lewis, J. Raff, M. Roberts, K. Walter, P. (2008) Molecular Biology Of The Cell. Fifth Edition, New York:Garland Science(148-149)

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