Amino acids usually exist in the form of Zwitter ions. This means that they consist of:
- AThe basic group $-NH_2$ and the acidic group $-COOH$
- BThe basic group $-NH_3^+$ and the acidic group $-CO_2^-$
- CThe basic group $-CO_2^-$ and the acidic group $-NH_3^+$
- DNo acidic or basic group
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