The fluid mosaic model of cellular membranes
→Membranes are composed of a phospholipid bilayer
→Phospholipids have a phosphate group (Hydrophilic Head)
→2 Fatty acids, 1 glycerol , 1 Phosphate
→Attracts to water
The freeze-etching technique
The freeze-fracture technique consists of
physically breaking apart (fracturing) a
frozen biological sample. Freeze fracture is
unique among electron microscopic
techniques in providing planar views of
the internal organisation of membranes.
1
, Fluid Mosaic Model
● Membrane is composed of a phospholipid bilayer with various
protein molecules
● Membrane is not solid
● There are no chemical bonds binding the lipid molecules to
each other.
2
→Membranes are composed of a phospholipid bilayer
→Phospholipids have a phosphate group (Hydrophilic Head)
→2 Fatty acids, 1 glycerol , 1 Phosphate
→Attracts to water
The freeze-etching technique
The freeze-fracture technique consists of
physically breaking apart (fracturing) a
frozen biological sample. Freeze fracture is
unique among electron microscopic
techniques in providing planar views of
the internal organisation of membranes.
1
, Fluid Mosaic Model
● Membrane is composed of a phospholipid bilayer with various
protein molecules
● Membrane is not solid
● There are no chemical bonds binding the lipid molecules to
each other.
2
