Name the molecule which is eliminated during the formation of a peptide bond.

In the primary structure of proteins,the amino acids are interconnected by-

Among the $\alpha$-amino acids - threonine,tyrosine,methionine,arginine and tryptophan,those which contain an aromatic group in their side chain are

Which of the following statements about $\alpha$-amino acids of proteins is incorrect?

Which of the following amino acids contains the $HN=C(NH_2)-$ linkage?

The main structural linkage of protein is