Question

the diagram above shows a strand of dna.
the structures labeled y in figure above are
nitrogen bases
phosphates.
deoxyrlbose sugars.
ribose sugars.

Explanation:

In DNA, the nitrogen bases are adenine (A), thymine (T), cytosine (C), and guanine (G). In the given DNA strand diagram, the structures labeled Y are A, T, C, G which are nitrogen bases. Phosphates are part of the DNA backbone (not labeled Y here). Deoxyribose sugar is also part of the DNA backbone. Ribose sugar is found in RNA, not DNA.

Answer:

nitrogen bases