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Q.
An amino acid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of’ amino acid is called
Biomolecules
Solution:
In neutral solution, an amino acid molecule exists as a dipolar ion (zwitter ion), i.e., molecule containing positive and negative ionic groups. The charge on the ion changes with $pH$. In an acidic solution (low $pH$) the amino acid picks up $H^+$ions and becomes positively charged. In alkaline solution (high $pH$) the amino acid donates $H^+$ions to the medium and becomes negatively charged. The $pH$ at which the amino acid is electrically neutral or the molecule exists as a zwitterion is called the isoelectric $pH$.
