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

(1) Neither lipids, nor proteins can flip flop

(2) Both lipids and proteins can flip flop

(3) While lipids can rarely flip flop, proteins can not

(4) While proteins can flip flop, lipids can not

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