Biomembranes et communications cellulaires

Exercices de Biomembranes et communications cellulaires PDF (L3-S5-Toxicologie)

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Exercices Corrigés Biomembranes et communications cellulaires PDF

Les biomembranes (membranes cellulaires) sont des doubles couches phospholipidiques dans lesquelles s’insèrent de manière asymétrique et inhomogène d’autres structures les caractérisant. La membrane délimitant la cellule est appelée membrane plasmique et les membranes des organites sont appelées par le nom de l’organite concerné (membrane nucléaire, membrane mitochondriale, etc.). En microscopie électronique on observe une tri-lamination de la membrane : un feuillet clair de 3 nm entouré par 2 feuillets sombres de 2,5 nm chacun ; l’épaisseur totale est donc d’environ 8 nm. Ceci a permis de mettre en évidence la structure en bicouche phospholipidique de la membrane plasmique.

Exercices:

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