The flexible nature of a cell membrane results from its

The flexible nature of a cell membrane results from its PHOSPHOLIPIDS.

Cell membrane is made up of four different types of molecules; namely phospholipids, cholesterol, proteins, and carbohydrates. Its flexibility is from phospholipids because phospholipids are made up of two layers; one layer is hydrophilic and the other is hydrophobic. Just like a vegetable oil, the hydrophobic layer of the phospholipid bilayer does not like water and is able to move sideways with in the cell membrane to avoid contact with water.   

Except hold on to his or her beliefs even if there is no evidence for those beliefs.