Consider the following forms of the amino acid serine (Ser) . Which statement concerning these structures is false? 
A) Structure IV represents the form of Ser present at its isoelectric pH.
B) Structure III represents the form of Ser present in the basic environment of the intestines.
C) Structure II represents the form of Ser present in the acidic environment of the stomach.
D) Structure I represents the zwitterionic form of Ser.
Correct Answer:
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