Amino acids usually exist in the form of Zwitter ions. This mean that they consist of

Options

A. The basis group `-NH_(2)` and the acidic group -COOH
B. The basic group `-NH_(3)^(+)` and the acidic group `-CO_(2)`
C. The basic group -`CO_(2)^(-)` and the acidic group `NH_(3)^(+)`
D. No acidic or basic group

Answer

C

Explanation

Zwitter ion is a dipolar ion containing both a positive and negative charge in the following form `underset("Zwitter ion")(R-overset(NH_(3)^(+))overset(|)(C)H-COO^(-))` . The basic group `CO_(2)^(-)` and acidic group `NH_(3)^(+)`.