Amino acids are responsible for the building blocks of protein.
So, the correct option is A.
The components of proteins are called amino acids. A protein is made up of multiple polypeptide chains, each of which is composed of amino acids. Amino acids are the basic units of proteins; they are small organic molecules with an alpha (central) carbon atom linked to an amino group, a carboxyl group, a hydrogen atom, and a variable element termed a side chain.
Two functional groups, an amino group, and a carboxyl group are present in amino acids. The amino acids work together to create a long protein chain called a polypeptide chain, which serves as the building block for proteins. Body protein as well as other vital nitrogen-containing substances like creatine and peptide must be synthesized using amino acids.
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