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.
CASTE SYSTEM AND SOCIAL ORDER (ORIGINATING FROM PURUSHA) (1) Brahmin/Brahman/Brahmana/Brahmanas - The first caste - A member of the highest caste in the Varna social order - formed of the group having as the chief duty the study and teaching of the Vedas and the performance of religious ceremonies.