The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrates. The plasma membrane protects intracellular components from the extracellular environment. The plasma membrane mediates cellular processes by regulating the materials that enter and exit the cell.
Members of the Shudra caste, for example, are relegated to performing hard physical work regardless of their skill, intelligence, or ambition. Those born into the Brahman caste must attend university or become a member of the clergy, even though they may show no interest or aptitude toward that end.
A principle difference between class and caste is that class in open for all and social mobility is possible. In the caste system the vertical mobility is not possible.Caste in India has religious background and everybody tries to fulfill the caste duties, but in class system of social stratification religion has place.ven in the urban society a constant tendency to make caste distinction is observed in the upper and middle classes. Thus the castes have maintained their importance in class system of social stratification. Difference between Caste and Class: SR.