Answer:
Each nucleotide is made up of Deoxyribose sugar, Phosphate group and a Nitrogen base. Deoxyribose sugars and Phosphate groups along with sugar-phosphate bonds form the sides of DNA ladder and the Nitrogen bases along with hydrogen bonds make up rungs of the ladder.
In DNA, the "rungs" between the two strands of DNA are formed from the nitrogenous bases adenine, thymine, guanine and cytosine.
The rungs of the DNA ladder are made up of four nitrogen bases. There are two purines-adenine and guanine, and two pyrimidines-cytosine and thymine.
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Step-by-step explanation: