Fifty clinical cases help you excel in biochemistry courses and the USMLE Step 1. The Case Files series is an award-winning learning system proven to improve exam scores. This series helps students to learn in the context of real patients instead of simply memorizing. Case Files: Biochemistry: Second Edition presents 50 clinical cases with open-ended questions which weave basic science concepts into the clinical scenario. Each case includes an extended discussion (including definitions and a pathophysiology discussion), key points, and 3-5 USMLE-style comprehension questions. The authors are experienced teachers from the University of Texas-Houston Medical School in Houston, Texas. Biochemistry is the study of the chemical processes in living organisms. It deals with the structure and function of cellular components such as proteins, carbohydrates, lipids, nucleic acids and other biomolecules.