Determine the pI of a glycine using potentiometric method

At the pI of glycine, the molecule exists predominantly as
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What does the pI (isoelectric point) of glycine represent?
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Why is glycine considered an amphoteric molecule?
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Which two groups in glycine are involved in the protonation and deprotonation processes during titration?
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For an amphoteric molecule, the form exists in high pH medium is
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