alleryGlycine has 2 amino acid forms in solution. Zwitterion:
A+NH₃-CH₂-COO⁻ (predominant at isoelectric point pI ≈ 6.0)
B-NH₂-CH₂-COOH
C-NH₂-CH₂-COO⁻
DNH₂-CH₂-COOH only
Answer & Solution
Correct answer: A. +NH₃-CH₂-COO⁻ (predominant at isoelectric point pI ≈ 6.0)
Glycine has acidic -COOH and basic -NH₂.
**In neutral aqueous:** zwitterion form +NH₃-CH₂-COO⁻ dominant. Net charge 0 at pI.
**Hence amino acids are high-melting solids (ionic-like).**
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