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Question

According to fluid mosaic model, plasma membrane is composed of


A
Phospholipids and oligosaccharides
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B
Phospholipids and hemicellulose
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C
Phospholipids and integral proteins
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D
Phospholipids, extrinsic proteins and intrinsic proteins
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Solution

The correct option is D Phospholipids, extrinsic proteins and intrinsic proteins
  • The fluid mosaic model of the biomembrane or cell membrane was proposed by SJ Singer and GL Nicolson in the year 1972.
  • According to this model, the transmembrane proteins are embedded within the phospholipid bilayer.
  • Transmembrane proteins are of two types-
  1. Extrinsic membrane proteins- are present outside the membrane which bound to the lipid layer by weak molecular forces.
  2. Intrinsic membrane proteins- are completely embedded in the membrane.
  • So, the correct answer is 'Phospholipids, extrinsic proteins and intrinsic proteins'.

Biology

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