what forms a protein
As a result, a modestly sized protein with only 300 amino acids has a molecular weight of 33,000 g/mol, and very large proteins can have molecular weights as high as 1,000,000 g/mol. Proteins are formed by joining the -CO2H end of one amino acid with the -NH2 end of another to form an amide. The -CONH- bond between amino acids is known as a peptide bond because relatively short polymers of amino acids are known as peptides. The same -CONH- bond forms the backbone of both proteins and synthetic fibers such as Nylon.