BIOLOGY
PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The pH in which the amino acid is a zwitterion ion a
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The resultant electrostatic charge is equal to 0
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The pH in which the amino acid is a zwitterion ion and the resultant electrostatic charge is equal to 0
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The pH in which the amino acid is a zwitterion ion and the resultant electrostatic charge is equal to 5
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Detailed explanation-1: -At a certain pH of the medium called an isoelectric point of an -amino acid, the Zwitterion behaves as neutral and does not migrate to any electrode on passing current. The isoelectric points are in the pH range of 5. 5 to 6.
Detailed explanation-2: -The isoelectric point is the pH at which a zwitterion is uncharged. The pH can affect the charge of a molecule by introducing protons (H+). The amino group of an amino acid is a very effective proton acceptor, so is considered to be basic. The carboxyl group is an effective proton donor and is considered to be acidic.
Detailed explanation-3: -At pH = 5.02, the pH = pI so the amino acid will exist as the zwitterion with both the positive and negative charges as shown above.
Detailed explanation-4: -Another main property of a Zwitterion is that it has an isoelectric point (represented as pI, pH(I), IEP). This point is the pH value at which the charge in molecules is neutral. Usually, the net charge on a molecule is greatly affected by the pH of its surrounding environment.