Solid interactions in statistical physics of biopolymers

: A short survey is presented of the development of statistical physics of biological macromolecules and its modern state. The main attention is paid to the analysis of the manifestation of scale invariance and fractal properties of biopolymers--DNA and proteins. Phase transitions related to the phase structure of DNA are briefly analysed. A more detailed account is given of phase transitions in globular proteins, denaturation problem, two phases of the melted globule and the theory of heteropolymers included. Some unsolved problems of this field of science and its prospects are discussed.