Answer:
The correct answer is - amino acids.
Step-by-step explanation:
Proteins are made up of amino acids by linking together by the peptide bonds therefore the building blocks of the proteins are amino acids and due to amino acids linked together by peptide bond they called polypeptide chain;
Amino acids are small organic molecules form by the process translation and have a central carbon atom with an amino -NH group, a hydrogen atom, a carboxyl group -COOH, and a side chain.