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The dipolar ion form of an amino acid is called a:

AZincate ion
BZirconate ion
CZwitter ion
DZeolite ion
Answer & Solution
Correct answer: C. Zwitter ion
1. The carboxyl group loses a proton. 2. The amino group takes one up. 3. The neutral doubly charged form is the zwitter ion. _Source: syllabus Chemistry Part 2, Unit 10 'Biomolecules'_
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