Question

what are the building blocks of proteins?
□ amino acids
□ nucleic acids
□ nitrogen bases
□ nucleotides
□ sugars

Explanation:

Proteins are polymers made by linking amino acids via peptide bonds. Nucleic acids (building blocks: nucleotides) form DNA/RNA. Monosaccharides build carbohydrates. Fatty acids and glycerol build lipids. So amino acids are protein's building blocks.

Answer:

The correct option is the one with "amino acids" (the first checkbox option, assuming the first option is labeled with "amino acids").