It is assumed that students will be already familiar with basic concepts of protein and nucleic acid structure, as well as enzyme kinetics and mechanisms, before using the Biochemistry of Metabolism educational web. A review of some elementary concepts relating to protein structure is provided here. For a more complete discussion see, e.g., Biochemistry by D. Voet & J. G. Voet, 3rd Ed, chapters 4, 7 & 8.