9/3/2009 1 Biological membranes Biological membrane = cell membrane Definition: semi-permeable barrier between cell and environment; between different environments in the cell responsible for different functions Types of cell membranes: Cell membrane = plasmalemma (plasma membrane) Inner membranes Nuclear envelope Membranes of smooth and rough ER Membranes of Golgi apparatus Membranes of mitochondrion (inner and outer) Membrane of lysosome Membrane of peroxisome Membranes of different vesicles !!! All cellular membranes: Have similar lipo-proteic structure; Have different properties and functions determined by: Heterogeneity of membrane proteins; + Heterogeneity of membrane phospholipids; + Heterogeneity of carbohydrates. The functions of biological membranes Biologic barrier; Compartmentalization of eukaryotic cells; Transport of ions and molecules; Receiving of signals; Cell connection; Support for enzymes (animation )
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9/3/2009
1
Biological
membranes
Biological membrane = cell
membrane
Definition: semi-permeable barrier
between cell and environment; between
different environments in the cell
responsible for different functions
Types of cell membranes:
Cell membrane = plasmalemma (plasma membrane) Inner membranes Nuclear envelope Membranes of smooth and rough ER Membranes of Golgi apparatus Membranes of mitochondrion (inner and outer) Membrane of lysosome Membrane of peroxisome Membranes of different vesicles
!!! All cellular membranes:
Have similar lipo-proteic structure;
Have different properties and functions determined by: