Question

although dna and rna have different structures, both are polymers made up of many repeating monomer units called nucleotides. each nucleotide is made up of three parts: a sugar with five carbons, also called a 5 - carbon sugar a phosphorus atom bound to four oxygen atoms, also called a phosphate group a nitrogen - containing compound, also called a nitrogenous base label the parts of the nucleotide.

Explanation:

A nucleotide has three components. The structure with -O - P - O - is the phosphate group. The five - carbon sugar is attached to the phosphate and nitrogenous base. The ring - like structure with nitrogen atoms is the nitrogenous base.

Answer:

The left - hand label is phosphate group, the right - hand label is nitrogenous base. (Assuming the structure in the middle is the 5 - carbon sugar connection point which is not fully shown in the provided image, but based on the known parts of the nucleotide structure and the given labels and chemical structures, these two labels can be correctly assigned).