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1. What do you mean by isoelectric point of amino acids?

2. What are Zwitter ions? Give one example.

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1. The pH at which the Zwitter ions do not migrate neither towards cathode nor towards anode is known as isoelectric point of the amino acids.

2. Amino acids possess both acidic and basic group, they generally exist as dipolar ions called Zwitter ions.

e.g. glycine H3N(+) – CH2 – COO(-)

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