This book describes fundamental mechanisms in both chemistry and biology, in order to present up-to-date catalytic pathways and molecular features of a series of "hot" enzymes including cytochromes P450, peroxidases, laccases, oxidases, dehydrogenases, kinases and phosphatases. The text will allow the reader to learn quickly how to solve kinetic and mechanistic problems in chemistry, biochemistry and enzymology. Its accessible style will assist young and more experienced scientists in presenting with confidence their kinetic and mechanistic results in modern high-impact chemical and biochemical journals even without significant previous experience in such studies.