Protein Science: Structure and MechanismAbout This Hardback Macromolecules which are composed of long chains of amino acid residues are called proteins. Each protein consists of at least one long polypeptide. The sequence of gene that is encoded in the genetic code is responsible for defining the sequence of amino acids in a protein. The lifespan of protein is measured in half life, and can range from minutes to years. Protein science is a branch of biology which attempts to develop an