DNA is double stranded, and the strands are antiparallel because they run in opposite directions. Each DNA molecule has two strands of nucleotides. Each strand has a sugar-phosphate backbone, but the orientation of the sugar molecule is opposite in the two strands. Thus the main reason of this antiparallel nature of the DNA is the presence of a phosphodiester bond that links the phosphate group to the hydroxyl group of the sugar molecule (present in alternate directions on either strand).
So, the correct option is 'phosphodiester bonds'.
Solve any question of Molecular Basis of Inheritance with:-
