Quantum biochemistry is a new field of science that has arisen at the intersection of biochemistry and quantum mechanics. A small book by the Hungarian scientist Janos Ladik contains the latest results of quantum mechanical studies of the electronic structure of biologically active molecules (DNA, proteins, porphyrins) and gives their biological interpretation. A special chapter is devoted to the prospects of quantum biochemistry and its capabilities in connection with solving a number of problems of pharmacology, genetics, oncology, gerontology, etc.