Plasma membrane is made up of __________.

Reason: Plasma membrane is a thin molecular layer that surrounds all living cells. The plasma membrane separates the cell from its surroundings and protects it from changes in its environment. The plasma membrane is primarily composed of 2 types of molecules. (1)        Lipids - Which are fats or oil molecules. Lipids help in transporting fat soluble substances across membrane. (2)        Proteins - Help in transporting substances across the membrane.             In most cells, plasma membrane is about 40% of Lipids and 60% of protein.Vitamins like fat soluble (Vitamin A, D, E, K) or water soluble (Vitamin B, C) are not able to perform functions like lipids and proteins.Therefore they are not present in cell membrane. However, Carbohydrates along with protein e.g. glycoprotein are present in cell wall.