What is the primary difference between the titration curves of amino acids with ionizable R groups and those without?

• A. Amino acids with ionizable R groups have two inflection points.
• B. Amino acids with ionizable R groups have three inflection points.
• C. Amino acids with ionizable R groups have no inflection points.
• D. Amino acids with ionizable R groups have only one inflection point.

Answer: (B)