Question

According to fluid mosaic model (proposed by Singer and Nicolson), plasma membrane is composed of

• A. Cellulose, hemicellulose
• B. Phospholipid and integrated protein
• C. Phospholipid, extrinsic protein, intrinsic protein
• D. Phospholipid and hemicellulose

Answer 1

The correct option is C Phospholipid, extrinsic protein, intrinsic protein

According to fluid mosaic model, plasma membranes are quasifluidic structures with a viscous lipid bilayer made up of phospholipids having proteins at places distributed as mosaic both on the surface and inside. Singer and Nicolson have described cell membrane as protein icebergs floating in sea of lipids. External proteins are called extrinsic proteins or peripheral proteins while the internal proteins are named intrinsic or integral.

So, the correct answer is 'Phospholipid, extrinsic protein, intrinsic protein'.