Answer:
Option). protein.
Explanation:
Proteins are macromolecules, made by polymerization of amino acids. Hence, amino acids are known as building blocks of the proteins. During protein synthesis, amino acids join together with the help of peptide bond to form polypeptide chains. These polypeptide chains arrange themselves and form proteins.
Examples of proteins are collagen, enzymes, silk, and hemoglobin.
Thus, the correct answer is option). protein.
