What is protein?

Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. They perform a vast array of functions within organisms, including catalyzing metabolic reactions, replicating DNA, responding to stimuli, and transporting molecules from one location to another. Proteins are fundamental building blocks and are essential for life. They are commonly used in food production, medicine (e.g., enzyme replacement therapy, antibodies), and various industrial applications (e.g., detergents, textiles).