Question

what is the part labeled a called?
nitrogen base
phosphate group
nucleotide
5 - carbon sugar

Explanation:

A nucleotide is composed of three parts: a phosphate group, a 5 - carbon sugar, and a nitrogen base. The structure labeled A in the diagram has the formula \(O = P - O^{-}\) which is characteristic of a phosphate group. A nitrogen base (like adenine, guanine, etc.) has a ring - like structure with nitrogen atoms. A 5 - carbon sugar has a five - membered ring with carbon atoms. A nucleotide is the combination of all three components.

Answer:

phosphate group