FLUID MOSAIC MODEL.pdf

Cell is the smallest structural and functional unit in the body of living
organism and micro-organism. Cell has a Cell membrane in its outer most
part in case of animals and cell wall for plant and for plants, cell membrane
is present under the cell wall. Cell membrane has a scientific structure. So,
many scientists gives description about the structure of cell membrane like
Sandwich Model, Unit Membrane model and Fluid Mosaic Model. But,
the Fluid Mosaic Model is widely acceptable.

1. PRESENTED BY SAYAN KUNDU

2. Introduction:-
Cellisthesmalleststructuralandfunctionalunitinthebodyofliving
organismandmicro-organism.CellhasaCellmembraneinitsoutermost
partincaseofanimalsandcellwallforplantandforplants,cellmembrane
ispresentunderthecellwall.Cellmembranehasascientificstructure.So,
manyscientistsgivesdescriptionaboutthestructureofcellmembranelike
SandwichModel,UnitMembranemodelandFluidMosaicModel.But,
theFluidMosaicModeliswidelyacceptable.

3. Abstract:-
•TheFluidmosaicModelofCellMembranewasfirstdescribedbythe
ScientistsSINGERANDNICOLSONat1972.
•Thismodelexplainsthestructureoftheplasmamembraneofanimalcellas
amosaicofcomponentssuchasphospholipids,proteins,cholesterolsand
carbohydrates.
•Accordingtothem,thecellmembraneisasemi-fluidorganizationwhose
fluidnatureisexpressedbyBilayersofLipids.
•Inthebilayersofthelipid,theProteinsarepresentasafloatingelements.

4. Description:-
•ThenatureoftheFluidmosaicmodelisdenotedbyBilayersofLipid.
AddingwithPhosphatethelipidsmadePhospholipid.
•ThetwoendsofthelipidmoleculesarecalledPolarEnd(OuterPart)
&NonPolarEnd(InnerPart).
•ThenonPolarendsareHydrophobicandPolarendsarehydrophilicin
nature
•ThelipidmoleculesareliquidinnatureastheyaremadebyUnsaturated
Fattyacids
•Withthepresenceofliquidandproteintherearesomeamount
ofcarbohydrateinthecellMembrane

5. •AddingwithLipidtheymadeglycolipidandaddingwithproteinthey
madeglycoprotein.
•TherearethreetypesofProteinspresentintheFluidMosaicModel.Theyare-
(a)IntrigalProtein:-
• Thesetypeofproteinsaresubmergedinthebilayerofthelipids
• Theycannotbeseparatedeasily.
(b)ExtrinsicProtein:-
• Proteinsthatremaininthesemi-submergedstateofthelipidbilayerare
knownasExtrinsicprotein.
• Sincetheyareassociatedwithweakelectricalbondswithlipids,sothey
canbeseparatedeasilyfromthestructure.

6. (C) Membrane Protein:-
• Adjacent to the membrane
• These proteins help the ion to transport from one end to another.