The lipid molecules present in plasma membrane have polar heads and non-polar tails (as shown in figure). Which option represents the correct arrangement of lipids in lipid bilayer ?

Options

A.
B.
C.
D.

Answer

B

Explanation

The lipid molecules are amphipathic, i.e., they posses both polar hydrophilic (water loving) and nonpolar hydrophobic (water repelling) ends. The hydrophilic region is in the form of a head occurring at outer surface while the hydrophobic part contains two tails of fatty acids. Hydrophobic tails usually occur towards the centre of the membrane. It in the formation of a lipid bilayer. Most common lipid in the bilayer is phospholipid.