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The rungs or steps of DNA are made up of , which are attached to the sides or railings of DNA, which are made up of .

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Deoxyribose, which is a pentose, and a phosphate group. These two molecules together form the two sides of the DNA. A sugar (deoxyribose) and a phosphate.
Diatonic254

The answer is nitrogenous base, deoxyribose sugar. The nitrogenous base bond complementarily; purines (Adenine and Guanine) pair with pyrimidines (Cytosine and Thymine). The deoxyribose sugar are 5-carbon rings that are connected to a phosphate molecule on their 5’ carbon. The nitrogenous base connect to the sugar on their 1’ carbon.

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