Nature makes every molecule for a specific purpose, such as nucleic acids to store and transmit genetic information to the next generation, carbohydrates as source of energy and raw materials for various natural products, lipids to build structure of the cell, proteins to carry out reactions efficiently at ambient conditions. Among these, the proteins are by far the most versatile biomolecules. They adapt to perform various roles in the cell such as catalyzing cellular processes, storing of essential metal ions, quenching of harmful intermediates such as superoxide, building defenses for the organism in the form of antibodies, and many more. They are among the fastest and highly specific in their function.
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