BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Zwitterions have a positive and negative charge in its structure.
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Zwitterions are dipolar ions.
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Zwitterions’ melting and boiling point are lower than expected.
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Amino acids can exist as zwitterions.
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Detailed explanation-1: -The zwitterion nature of amino acids, with both positive and negative charges on the same molecule, allows tight binding of amino acids to one another by ionic interactions. Hence the breaking of these inter-molecular interactions require relatively high energy leading to high melting points.
Detailed explanation-2: -At isoelectric point, they exists as as Zwitter ions. Hence, the statement shown by option B is not correct. They have no net charge.
Detailed explanation-3: -Solution : o-and p-aminobenzoic acids do not exist as a Zwitter ion.
Detailed explanation-4: -If you decrease the pH by adding an acid to a solution of an amino acid, the-COO-part of the zwitterion picks up a hydrogen ion. This time, during electrophoresis, the amino acid would move towards the cathode (the negative electrode).