Final answer:
The inner leaflet of the outer membrane is composed of phospholipids and proteins, while the outer leaflet is made of carbohydrates. This asymmetrical composition of the plasma membrane contributes to its selective nature and helps cells recognize and communicate with each other.
Step-by-step explanation:
The inner leaflet of the outer membrane is composed of phospholipids and proteins, while the outer leaflet is made of carbohydrates. Carbohydrates are attached to lipids or proteins on the exterior surface of the membrane, forming glycolipids or glycoproteins. This asymmetrical composition of the plasma membrane contributes to its selective nature and helps cells recognize and communicate with each other.