Question

Choose the correct answer from the alternatives given.
According to the fluid mosaic model of membrane structure, proteins of the membrane are

• A. Spread in a continuous layer over the inner and outer surfaces of the membrane
• B. Confined to the hydrophobic core of the membrane
• C. Randomly oriented in the membrane, with no fixed inside-outside polarity
• D. Embedded in a lipid bilayer

Answer 1

Answer: (D)

Embedded in a lipid bilayer

In the fluid mosaic model of the cell membrane, proposed by Singer-Nicolson in 1972, the phospholipid bilayer has integrated as well as peripheral proteins embedded in it. The integrated proteins are found on the inside and span across the bilayer, while the peripheral proteins are found at the periphery of the lipid layers.

So, the correct answer is 'Embedded in a lipid bilayer'.