Which of the following amino acid has lowest iso-electric point?

Glycine

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Alanine

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Aspartic acid

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Lysine

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Solution

The correct option is B Aspartic acid
The $p^{H}$ at which a molecule is electrically neutral or carries zero net charge is the isoelectric point ( $P^{I}$ ) of the molecule.
Here, out of the four compounds, aspartic acid has the lowest iso-electric point.

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