The monomer of a polypeptide is........

What do you mean by the sodium-potassium pump?

Amino acids contain which of the following functional groups?

Which structure of protein remains intact after coagulation of egg white on boiling?

Which of the following is not an essential amino acid?

$A$ 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: