Answer:
To maintain the cell fluidity of the membrane.
Step-by-step explanation:
Plasma membrane or cell membrane is the the outer covering of the cell. The plasma membrane composed of lipids, proteins and carbohydrates attaches to the lipids and protein.
The plasma membrane is a bilayer structure in which the two fatty acid chain are arranged together by hydrophobic interaction. This bilayer structure maintains the cell fluidity and also maintains the membrane permeability.