1.

Amino acids generally exist in the form of Zwitter ions. This means they contain

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basic - `NH_2` group and acidic -COOH group
the basic - `overset+NH_3` group and acidic `-COO^-` group
basic -`NH_2` and acidic - `H^+` group
basic -`COO^-` group and acidic - `overset+NH_3` group

Solution :Zwitter ion contains both +ve and -ve charge. Proton of -COOH group is transferred to the `-NH_2` group . `-NH_3^+` group is acidic since it can donate a proton and `-COO^-` group is basic since it can ACCEPT a proton


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