Virus Structure and Method of Invasion

Virus Structure and Method of Invasion -...

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Virus Structure and Method of  Invasion Higher Biology
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Introduction to viruses Obligate parasites Specific to type of cells they target - poliomylelitis  virus  a ttac ks   nerve  c e lls - hepatitis  virus  atta c ks   liver  c e lls Reproduction  is  the ir o nly true   c ha ra c te ris tic  o f b e ing  a live Muc h s m alle r than b a c te ria (20-300nm )
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Vira l S truc ture Not a cell! DNA o r RNA (re tro virus ) S urro unde d b y pro te c tive  pro te in c o at  ( capsid) G e ne tic  m a te ria l c arrie s  info rm atio n fo r  m ultiplic a tio n Hijac ks  b io c he m ic al m a c hine ry o f ho s t c e ll  to  c a rry the s e  pro c e s s e s  o ut 
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Bacteriophage
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Inva s io n o f a  c e ll b y a  virus Virus can lie dormant for many years until it comes into  contact with a suitable host cell Binds with molecules on surface of host cell Herpes -whole virus enters cell Bacteriophage -viral DNA injected via hollow tail
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Virus Structure and Method of Invasion -...

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