According to the Diagram, How Many Titratable Groups Does This

Question

According to the diagram, how many titratable groups does this amino acid have? 
A) 0 
B) 1 
C) 2 
D) 3 
E) It cannot be determined by this diagram.

Accepted Answer

The diagram shows two titratable groups: the amino group (-NH2) and the carboxyl group (-COOH). Both of these groups can donate or accept protons during a titration, making a total of two titratable groups for this amino acid.