This textbook gives compact introductions to the basics of the field (areas such as molecular cell biology and statistical physics) and then presents in-depth discussions of more advanced biophysics subjects, progressing to state-of-the-art experiments and their theoretical interpretations. The book is unique by offering a general introduction to biophysics, yet at the same time restricting itself to processes that occur inside the cell nucleus and that involve biopolymers (DNA, RNA, and proteins). This allows for an accessible read for beginners and an springboard for specialists who wish to continue their study in more detail.