What is a characteristic of the phospholipid bilayer of cell membranes?

The phospholipid bilayer of cell membranes is characterized by its dynamic structure that allows for movement. This fluidity is essential for various cellular functions, including the movement of proteins and lipids within the membrane, which can shift laterally. The ability of the phospholipid components to move also facilitates the intercalation of different molecules, allowing cells to maintain their integrity and functionality by adapting to changes in their environment.

The bilayer's structure, with hydrophilic (water-attracting) heads facing outward and hydrophobic (water-repelling) tails tucked inward, contributes to its fluid nature. This dynamic aspect is crucial for processes such as diffusion, vesicle formation, and signal transduction, making the cell membrane an adaptable barrier rather than a rigid structure.