The cell membrane is primarily composed of:

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(A) According to the $Fluid \ Mosaic \ Model$ proposed by $Singer$ and $Nicolson$ in $1972$,the cell membrane is composed of a lipid bilayer in which

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Proteins embedded in a bilayer of phospholipids.

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(A) According to the $Fluid \ Mosaic \ Model$ proposed by $Singer$ and $Nicolson$ in $1972$,the cell membrane is composed of a lipid bilayer in which protein molecules are embedded. The lipid bilayer consists primarily of phospholipids,which provide the fluid nature to the membrane,while the proteins are embedded within this bilayer,either peripherally or integrally,to perform various functions such as transport and signaling.

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