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  4. Fluid mosaic model was proposed by :

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Q. Fluid mosaic model was proposed by :

Delhi UMET/DPMTDelhi UMET/DPMT 2006

Solution:

Singer and Nicholson $(1972)$ proposed the fluid mosaic model of cell membrane. According to this model cell membranes are quasifluid with a viscous lipid bilayer having mosaic of proteins on the surface and inside. Robertson $(1959)$ proposed the unit membrane model for cell membrane. It states that all biomembranes have a trilaminar structure with an electron transparent lipid bilayer lying sandwithched between electron dense protein layers. Danielli and Davson states that in plasma membrane a double phospholipid layer is surrounded on the either side by a layer of hydrated globular proteins or $P-L-L-P$. Huxley $(1868)$ called the protoplasm as physical basis of life.