pres 23-virus
TRANSCRIPT
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VIRUS
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CARACTERÍSTICAS DE LOS VIRUS 1.- Son organizaciones macromoleculares.2.- Constitución: ácidos nucleicos y
proteínas; 3.- Pueden poseer Lípidos e Hidratos de
carbono. 4.- Tamaño variable;5.- Son agentes infecciosos 6.- Parásitos estrictamente intracelulares; 7.- Capacidad de reconocer células e
infectarlas
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Nopueden replicarse por sí mismos.No pueden formar sus propias moléculasDeben infectar células y aprovechar la
maquinaria metabólica celular para hacerlo. Existen los denominados “Virus-like agents”
como :Transposones , Plásmidos, Viroides,
Priones.
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Organismos que parasitan los virus
Los huéspedes que ocupan pueden ser animales, vegetales o bacterias.
Entre los microorganismos, los virus parasitan bacterias, son los bacteriófagos o fagos,
No se conocen virus que infecten algas, hongos o protozoos.
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Bacteriófago
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GENOMA VIRAL
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BACTERIÓFAGO
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ESTRUCTURA VIRAL
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INVASIÓN VIRAL
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Enfermedades VIRALES Humanas Más comunes: Poliomielitis, Gripe, Viruela, Sarampión, Fiebre amarilla, Encefalitis, Paperas,
SIDA etc.
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Actualmente se cree que algunos tumores cancerosos son también de origen vírico.
Las infecciones víricas en general, no pueden ser tratadas con antibióticos.
El interferón, producto biológico sintetizado por los tejidos invadidos por un virus, es activo contra infecciones causadas por otros.
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VMT
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PAPERAS
PAPILOMA
SARAMPION
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sida