Zwitterion (dipolar ion) form of amino acids

1. A.
   $\text{H}_2\text{N-CH}_2\text{-COOH}$
2. B.
   $\text{H}_3\text{N}^+\text{-CH}_2\text{-COO}^-$
3. C.
   $\text{H}_3\text{N}^+\text{-CH}_2\text{-COOH}$
4. D.
   $\text{H}_2\text{N-CH}_2\text{-COO}^-$

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1. A.
   $\mathrm{NH_2CH_2COOH}$
2. B.
   $\mathrm{CH_3COOH}$
3. C.
   $\mathrm{CH_3CH_2NH_2}$
4. D.
   $\mathrm{CCl_3NO_2}$

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1. A.
   Ketones
2. B.
   $\alpha$-Amino acids
3. C.
   Carbohydrates
4. D.
   Fatty acids

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