Where are peripheral proteins located in the RBC membrane?

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Multiple Choice

Where are peripheral proteins located in the RBC membrane?

Peripheral proteins sit on the membrane’s surface on the cytoplasmic (inner) side, attached by non-covalent interactions to integral proteins or to lipid head groups. They are not embedded in the hydrophobic core of the bilayer. In red blood cells, this inner-side position is crucial because peripheral proteins like spectrin, ankyrin, and protein 4.1 form the membrane skeleton that links to the lipid bilayer, helping maintain the characteristic biconcave shape and flexibility as the cell squeezes through small vessels. Proteins that span the membrane or are embedded within the bilayer are integral/transmembrane proteins, not peripheral ones, which is why the peripheral ones are best described as being on the inner surface.

Peripheral proteins sit on the membrane’s surface on the cytoplasmic (inner) side, attached by non-covalent interactions to integral proteins or to lipid head groups. They are not embedded in the hydrophobic core of the bilayer. In red blood cells, this inner-side position is crucial because peripheral proteins like spectrin, ankyrin, and protein 4.1 form the membrane skeleton that links to the lipid bilayer, helping maintain the characteristic biconcave shape and flexibility as the cell squeezes through small vessels. Proteins that span the membrane or are embedded within the bilayer are integral/transmembrane proteins, not peripheral ones, which is why the peripheral ones are best described as being on the inner surface.

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