Identify the chemical structure of DNA by:

Identify the chemical structure of DNA by listing the four nitogen-conttaining bases, sugar, and phosphatte group for DNA nucleotides.

DNA is made up of pairs of Adenine and Thymine and Cytosine and Guanine. (Nitrogen containing bases)
One nucleotide has only ONE of those four along with a phosphate group and a six carbon sugar.
Hope this helps, I wasn't exactly sure of the question.

The nitrogen bases are adenine(purine), guanine(purine), thymine(pyrimidine), and cytosine(pyrimidine), the DNA has a pentose sugar called ribose, and phosphates connected to the ribose sugar creating the backbone. So we can say that the sugar and phosphate create the backbone of DNA, and the nitrogenous bases are connected to the sugar phosphate backbone in a double helix shape.