Do subscribe to our channel HEALTH SCIENCE and share the videos Proteins are large biomolecules , or macromolecules , consisting of one or more long chains of amino acidresidues . Proteins perform a vast array of functions within organisms , including catalysing metabolic reactions , DNA replication , responding to stimuli , and transporting molecules from one location to another. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes , and which usually results in protein folding into a specific three-dimensional structure that determines its activity. In our body we have total 16%Protein of our body weight. It is the foundation of energetic and healthy life. A linear chain of amino acid residues is called a polypeptide . A protein contains at least one long polypeptide. Short polypeptides, contai...