Question

dna is a nucleic acid polymer composed of which repeating structural unit?
o nucleotides
o phosphate groups
o ribosomes
o proteins

Explanation:

DNA is a nucleic acid. Nucleic acids are polymers made up of nucleotides. Each nucleotide has a sugar, a phosphate group, and a nitrogen - containing base. Phosphate groups are just a part of the nucleotide. Ribosomes are cellular structures involved in protein synthesis. Proteins are different macromolecules from nucleic acids.

Answer:

nucleotides