Question

an amino acid is to a protein as a ______ is to a nucleic acid.
protein
nucleotide
purine
proton
neutron

Explanation:

Amino acids are the building - blocks of proteins. Nucleotides are the building - blocks of nucleic acids. Purines are part of nucleotides, while protons and neutrons are sub - atomic particles not related to the structure of nucleic acids in this context.

Answer:

B. nucleotide