Which amino acid is achiral?

How many amino acids are present in insulin?

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point $6.0$), glutamic acid $(3.2)$, and arginine $(10.7)$ buffered at $pH$ $6.0$. What is the fate of the three amino acids?

Which of the following is not an essential amino acid?

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is called . . . . . . structure of that protein.

Denaturation of proteins leads to loss of its biological activity by