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 movement)?

Step-by-step solution

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 surfaces of which are interrupted by protein molecules. Some proteins are attached at the polar surface of the lipid (ie, called extrinsic protein) while, other (called intrinsic proteins) either partially penetrate the bilayer or span the membrane entirely to stick out on both sides (called transmembrane proteins). Mobility of memb