Keeping in view the 'fluid mosaic model' for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop moment)?

Both lipids and proteins can flip-flop

While lipids and proteins can flip -flop

While proteins can flip-flop, lipids cannot

Neither lipids, nor proteins can flip-flop

Solution

While lipids and proteins can flip -flop

singer and Nicolson (1972) suggested the widely accepted fluid mosaic model of biological membranes. According to this model, the plasma membrane contains a bimolecular lipid layer, both surface of which are interrupted by protein molecules. Some proteins are attached to the polar surface of the lipid (ie, called extrinsic protein) while, other (called intrinsic proteins) either partially entirely to stick but on both sides (called transmembrane proteins). The Movement of lipid molecules from one lipid monolayer to another monolayer is called flip-flop movement. Flip-flop movement is rarely found in lipid molecules whereas it remain absent in protein molecules.

Some More Questions From Locomotion and Movement Chapter

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Locomotion And Movement

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