Consider the following statements:

A: The chemical and physical properties of amino acids are essentially of the amino, carboxyl and the R functional groups.

B: In solutions of different pH, the structure of amino acids changes.

Select the correct option.

The chemical and physical properties of amino acids are essentially of the amino, carboxyl and the R functional groups. Based on number of amino and carboxyl groups, there are acidic (e.g., glutamic acid), basic (lysine) and neutral (valine) amino acids. A particular property of amino acids is the ionizable nature of $–{\mathrm{NH}}_2$ and –COOH groups. Hence in solutions of different pH, the structure of amino acids changes.