At the isoelectric point , amino acids are present as

Options

A. `H_(2)N-underset("R")underset("|")("C")H-COOH`
B. `H_(3)overset(+)(N)-underset("R")underset("|")("C")H-CO overset(-)(O)`
C. `overset(+)(N)H_(3)-underset("R")underset("|")("C")H-COOH`
D. `H_(2)N-underset("R")underset("|")("C")H-CO overset(-)(O)`

Answer

B

Explanation

At Iso electric point amino acid exist with both + Ve and - Ve charge.