At the isoelectric point, amino acids are present as

Options

A. `H_(2)N-CHR-CO OH`
B. `overset(+)(N)H_(3)-CHR-CO O^(-)`
C. `NH_(2)-CHR-CO O^(-)`
D. `overset(+)(N)H_(3)-CHR-CO OH`

Answer

B

Explanation

AT isoelectric amino acids exist as zwitter ion `overset(+)(N)H_(3)-CH(R)-CO O^(-)`