Which component primarily makes up the cell membrane?

The cell membrane, also known as the plasma membrane, is primarily made up of a phospholipid bilayer, along with embedded proteins and cholesterol. The phospholipid bilayer forms the foundation of the membrane structure, providing a semi-permeable barrier that separates the internal environment of the cell from the external environment.

Phospholipids have hydrophilic (water-attracting) "heads" and hydrophobic (water-repelling) "tails," which organize themselves in a bilayer formation; the hydrophilic heads face the aqueous environments inside and outside the cell, while the hydrophobic tails face each other, away from water. This unique arrangement is crucial for maintaining cell integrity and fluidity.

Embedded within this bilayer are various proteins that serve different functions, such as transport, signaling, and maintaining the cell's shape. Cholesterol molecules are interspersed among the phospholipids, providing stability and fluidity to the membrane, especially in varying temperatures. This combination of phospholipids, proteins, and cholesterol is essential for the dynamic nature of the cell membrane, allowing it to be flexible while still maintaining its structural integrity.

Other options do not accurately represent the main components of the cell membrane. Car