According to widely accepted "fluid mosaic model" cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements are incorrect -

Question

( A ) Proteins in cell membranes can travel within the lipid bilayer
( B ) Proteins can remain confined within certain domains of the membranes
( C ) Proteins can also undergo flip-flop movements in the lipid bilayer
( D ) Many proteins remain completely embedded within the lipid bilayer