paredcelualryglicocalix2010 2011new 110703040632 phpapp01.ppsx
DESCRIPTION
pared celular y glicocalixTRANSCRIPT
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GLICOCALIXY
PARED CELULAR
GLICOCALIXY
PARED CELULAR
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Águeda Mª Barcia Iravedra I.E.S. Monte Castelo de Burela
También se llama membrana de secreción animal
GLICOCALIXGLICOCALIX
Se encuentra por fuera de la membrana plasmática en casi todas las células animales
Es de naturaleza glicídica, está formada por los oligosacáridos y polisacáridos que forman parte de los glucolípidos y glucoproteínas que forman la cara externa de la membrana plasmática.
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GLICOCALIXGLICOCALIX
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Funciones:
GLICOCALIXGLICOCALIX
Identificación
inmunológica
Receptor de moléculas y
señales
Protege la membrana
plasmática de daños
mecánicos y químicos
Interviena en la regulación
del crecimiento y reproducción
celular
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PARED CELULARPARED CELULAR
Podemos encontrarla
en las plantas
en las algas
en los hongos
en las bacterias
pero tiene diferente composición
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PARED CELULARPARED CELULAR
En las algas
celulosa pectina
En los hongos
quitina
En las bacterias
peptidoglucanos
lípidos
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PARED CELULARPARED CELULAR
En las células vegetales
celulosa
Y, dependiendo del tipo de células también puede incorporar
lignina suberina cutina
salesminerales
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PARED CELULARPARED CELULAR
En las células vegetales
La pared celular crece de dentro a fuera y consta básicamente tres capas :
LÁMINA MEDIA
PARED PRIMARIA
PARED SECUNDARIA
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