Final answer:
The plasma membrane is composed of phospholipids, cholesterol molecules, proteins, and carbohydrates, each playing a distinct role in the membrane's structure and function.
Step-by-step explanation:
The plasma membrane contains a complex arrangement of molecules, including phospholipids, cholesterol molecules, many proteins, and carbohydrates. Phospholipids form the bilayer structure of the membrane, providing a fluid matrix and creating a barrier between the intracellular and extracellular environments. Cholesterol is interspersed within the phospholipid bilayer, contributing to the membrane's fluidity and stability. Proteins are embedded within this bilayer, acting as transporters, receptors, enzymes, or for structural support. Carbohydrates are linked to proteins and lipids on the extracellular side of the membrane, contributing to cellular recognition and adhesion processes.