What cellular structure contains a double layer of phospholipids that control the movement of materials in and out of the cell?

The cellular structure that contains a double layer of phospholipids is the plasma membrane, also known as the cell membrane. This bilayer acts as a selective barrier, controlling the movement of materials into and out of the cell. Embedded proteins within the membrane facilitate transport and communication, while the fluid nature of the phospholipid bilayer allows for flexibility and dynamic interactions.