Whe gave fluid mais model ? Draw themordel and write its points main
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Answer:
Fluid mosaic model was proposed by Singer and Nicolson in 1972. According to this model, the quasi-fluid nature of lipids enables lateral movement of proteins within the overall bilayer. This ability to move within the membrane is measured as its fluidity. The plasma membrane is composed of lipids that are arranged in a bilayer and within the membrane with the polar head towards the outer sides and the hydrophilic tails towards the inner part. Because of this the nonpolar tail of saturated hydrocarbons is protected from the aqueous environment. The plasma membrane consists of 52% protein and 40% lipids. Peripheral proteins lie on the surface of membrane while the integral proteins are partially or totally buried in the membrane.
Answer:
Fluid-Mosaic model is the most recent model of a biomembrane proposed by Singer and Nicolson in 1972. According to this model, the membrane does not have a uniform disposition of lipids and proteins but is instead a mosaic of the two. Further, the membrane is not solid but is quasifluid. The quasifluid nature of the membrane is shown by their properties of quick repair, dynamic nature, ability to fuse,expand and contract, grow during cell growth and cell division, secretion, endocytosis and formulation of intercellular junctions.
Fluid-Mosaic model postulates that the lipid molecules are present in a viscous bilayer as in lamellar model. Protein molecules occur at places both inside and on the outer side of lipid bilayer- protein icebergs in a sea of lipids. The internal proteins are called intrinsic or integral proteins while the external ones are known as extrinsic or peripheral proteins.