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NEET UG CHEMISTRY MCQ: BIOMOLECULES
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An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0) glutamic acid (3.2) and arginine (10.7) buffered at pH6. What is the fate of the three acids?
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Correct option: A
Glutamic acid migrates of anode at pH6. Arginine present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution.
Option A (Glutamic acid migrates of anode at pH6. Arginine present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution.) is correct because at pH 6, glutamic acid is negatively charged and migrates to the anode, arginine is positively charged and migrates to the cathode, and alanine is neutral and remains in solution.
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