What is true of fluid mosaic model?

The correct option is A. Protein embedded in phospholipid bilayer

• The fluid mosaic model of the biomembrane or cell membrane was proposed by S.J. Singer and G.L. Nicolson in the year 1972.
  
• According to this model, the protein molecules are embedded in the phospholipid bilayer.
  
• Thus, the proteins are seen as icebergs in the sea of lipids.
  
• The lipid bilayer of the cell membrane provides fluidity, flexibility and elasticity to the membrane and the proteins seem to be floating in the sea of lipids.
  
• So, the correct answer is 'Protein embedded in phospholipid bilayer'.