Final answer:
DNA structure includes nitrogenous base pairs forming the ladder rungs and phosphate groups with deoxyribose sugars forming the side rails.
Explanation:
The rungs of the DNA ladder are formed by the nitrogenous base pairs, specifically adenine-thymine and guanine-cytosine, which are held together by hydrogen bonds. The phosphate groups and deoxyribose sugars form the sugar-phosphate backbone of the DNA strands, resembling the side rails of the ladder.
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