Which biophysical technique measures the distance between two points in a biomolecule?

What is the term for the study of the physical principles underlying biological systems? Which technique would you use to study the dynamics of a protein-ligand interaction? Which type of spectroscopy measures the vibrational modes of molecules? Which type of microscopy uses a focused laser beam to image biological samples? What is the name of the process by which cells sense and respond to mechanical forces? What is the primary reason for the asymmetry of the protein structure? What is the name of the process by which cells generate force to move or change shape? Which biophysical technique measures the distance between two points in a biomolecule? What is the term for the minimum energy required for a protein to fold into its native structure? Which biophysical technique measures the rotation of a molecule around its axis?