Verified Answer :

The DNA atom is formed like a turned step. Prior work had demonstrated that DNA is made out of building squares called nucleotides comprising of a deoxyribose sugar, a phosphate gathering, and one of four nitrogen bases cytosine (C), adenine (A), guanine (G), and thymine (T),

W0lf93

the structural components that form the rungs of the ladder would be: nitrogenous base pairs

Nitrogeneous base pairs consist of G-Guanine A-adenine T-Thymine and C-Cytosine, and oppose the DNA strand to form "twisted ladder" or double helix that is found in nucleotides