Answer:
A nucleotide is made up of three parts: a phosphate group, a 5-carbon sugar, and a nitrogenous base. The four nitrogenous bases in DNA are adenine, cytosine, guanine, and thymine. RNA contains uracil, instead of thymine.
Each nucleotide is a polymer made up of three parts:
A five-carbon sugar (2'-deoxyribose in DNA or ribose in RNA)
A phosphate molecule
A nitrogenous (nitrogen-containing) base
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