Glycine may be classed as all of the following except

Which of the following is not an amino acid?

Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form is subjected to a physical change like a change in temperature or a chemical change like a change in $pH$,denaturation of proteins takes place. Explain the cause.

Identify the side chain $(R)$ group present in Leucine,an amino acid.

The Biuret test is not given by:

The amino acid containing an indole part is