Biochemistry is very time-consuming, and spending only one or two nights studying for an exam is a recipe for disaster. This Companion is designed to help students cope with the volume of detail in a biochemistry course. It is carefully arranged so that the material matches the content of Biochemistry: A Short Course, Fourth Edition. Each chapter in this Companion consists of an Introduction, Learning Objectives, a Self-Test, Answers to Self-Test, Problems, and Answers to Problems.