The Third Mexican Meeting on Mathematical and Experimental Physics brought together scientists from many different fields. The Meeting was divided into three Symposia: (i) Physical Chemistry, (ii) Biological Physics, (iii) Gravitation and Cosmology. These proceedings presents the papers of the Biological Physics Symposium. The main objective of the symposium was to open new lines of research for young scientists and promising graduate students interested on Biophysics. Topics discussed included biological physics, Ions and membranes, DNA, proteins and macro systems.