<prompt> Most common physiological form of DNA -A-formB-formZ-formC-form  <response>: Ans. is b i.e., B-form o DNA can exist in at least six forms, i.e. A, B, C, D, E and Z.o The B-form of DNA is the most common form of DNA and is right-handed helix.o It is the strandard DNA structure with 10 base pairs per turn.o Watson and Crick model describes the B-form of DNA.o Other forms of DNA are A-form contains 11 base pairs per turn and is right handed helix and Z-form contains 12 base pairs per turn and is left handed helix.o Z-form is favored by alternating G-C sequences in alcohol and high salt solution; and is inhibited by alternating A-T sequnces Note-B form has minimum base pairs per turn, i.e. 10. 