The end product of protein digestion is

Proteins function as .......

The number of peptide bonds in the compound is:

The amino acid which is basic in nature is

$A$ 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:

Which structure$(s)$ of proteins remain$(s)$ intact during the denaturation process?