A.Correct option A
B.Explanation for correct option:
- Proteins are building blocks of the body.
- The proteins are made up of amino acids. The amino acids are linked together by peptide bonds to form a protein.
- A peptide bond is formed by the linkage of the carboxyl group of one amino acid with the amino group of the amino acids.
- It is known as a macromolecule as it is made up of a large number of molecules.