Step by step, with real proteins in 3D and the map of metabolism always at hand
Biochemistry follows the syllabus of the medical school exam, step by step. It is not a text with a picture beside it: the proteins are the real crystals of the Protein Data Bank, in 3D, to turn and touch residue by residue. Drag a point along the oxygen curve and watch haemoglobin go from form R to form T as oxygen leaves its four haems.
Each step has something to do with your hands, the explanation you need and a check with its answers marked. The numbers come from the scientific literature, with their sources, and the app remembers in your browser the steps you have done.