A: RBC membrane is highly flexible.R: Amount | vedclass

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(B) The $RBC$ membrane is highly flexible due to the fluid mosaic nature of the plasma membrane,which allows for the movement of proteins and lipids.P

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Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

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(B) The $RBC$ membrane is highly flexible due to the fluid mosaic nature of the plasma membrane,which allows for the movement of proteins and lipids.Peripheral (extrinsic) proteins are indeed more abundant on the cytoplasmic face of the plasma membrane compared to the extracellular face.However,the flexibility of the $RBC$ membrane is primarily attributed to the fluid nature of the lipid bilayer and the underlying cytoskeletal network (like spectrin),rather than the specific distribution of extrinsic proteins.Therefore,while both statements are factually correct,the Reason is not the direct explanation for the Assertion.

$A$: $RBC$ membrane is highly flexible.
$R$: Amount of external protein in the cytoplasmic face of the membrane is more.

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$A$: $RBC$ membrane is highly flexible.$R$: Amount of external protein in the cytoplasmic face of the membrane is more.