The level of blood sugar in our body is maintained by which protein?

Identify the essential amino acid from the following.

The main structural linkage of protein is

Write a note on denaturation of proteins.

$A$ tetrapeptide has a $-COOH$ group on alanine. This produces glycine $(Gly)$,valine $(Val)$,phenylalanine $(Phe)$,and alanine $(Ala)$ on complete hydrolysis. For this tetrapeptide,the number of possible sequences (primary structures) with the $-NH_2$ group attached to a chiral center is:

The total number of amino acids present in insulin is