Biochemistry is a modern classic that had been thoroughly revised. Explains biochemical concepts while offering a unified presentation of life and its variation through evolution. Incorporates both classical and current research to illustrate the historical source of much of our biochemical knowledge.
This book is my all-time favorite Biochemistry text. It explains everything in thorough detail, and I mean EVERYTHING. One of my biggest adulthood regrets was selling my copy after I graduated. The material is easy enough to understand for undergraduates but Voet and Voet go deep enough for graduate/medical level understanding.