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.
The Buddha and the Caste System. The Buddha was born into the highest caste, the Brahmans, but still didn't believe in the caste system. Buddhanet tells how the Buddha ridiculed priests with superiority complexes. Despite the Buddha's teachings, some Buddhist sects still practice the caste system.