Which of the following is not an essential amino acid?

Which functional group participates in disulphide bond formation in proteins?

What is the relationship between the isoelectric point and the solubility of amino acids?

The $pH$ value of the solution in which a particular amino acid does not migrate under the influence of an electric field is called the

Which of the statements about "Denaturation" given below are correct?
$A$. Denaturation of proteins causes loss of secondary and tertiary structures of the protein
$B$. Denaturation leads to the conversion of double strand of $DNA$ into single strand
$C$. Denaturation affects primary structure which gets distorted

Among the following compounds,the most basic amino acid is: