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:
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A zwitter ion is a neutral molecule having both the cationic and anionic charges on the same molecule. Amino acids are the best known examples of zwitterion.
In acidic solution, amino group accepts a hydrogen ion to become positively charged. Whereas, in alkaline solution the carboxyl group donates a hydrogen ion to become negatively charged. The pH at which the amino acid is electrically neutral is called isoelectric pH.
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