Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'gamma-amino-beta-hydroxybutyric acid zwitterion'?

A. Zwitterionic form of N(4)-{N-acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->3)-[N-acetyl-beta-D-glucosaminyl-(1->2)-alpha-D-mannosyl-(1->6)]-beta-D-mannosyl-(1->4)-N-acetyl-beta-D-glucosaminyl-(1->4)-[alpha-L-fucosyl-(1->3)]-N-acetyl-beta-D-glucosaminyl}-L-asparagine.
B. Zwitterionic form of 3-chloro-L-alanine arising from transfer of a proton from the carboxy to the amino group; major species at pH 7.3
C. Zwitterionic form of gamma-amino-beta-hydroxybutyric acid having an anionic carboxy group and a protonated amino group.
D. An amino acid-zwitterion obtained by transfer of a proton from the carboxy to the amino group of any alpha-amino acid; major species at pH 7.3.

Answer: Zwitterionic form of gamma-amino-beta-hydroxybutyric acid having an anionic carboxy group and a protonated amino group.