what forms the rungs inside the dna molecule
the base pairs. The rungs of the DNA ladder are formed by nucleotides (Adenine with Thymine, and Guanine with Cytosine) bonded together with Hydrogen bonds. the base pairs. The rungs of the DNA ladder are formed by nucleotides (Adenine with Thymine, and Guanine with Cytosine) bonded together with Hydrogen bonds.