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Natural proteins are conmposed primarily of 20 d-amino acids. which one of the following statements is tnue for any of these amino acids in a solution of ph 1.5
Natural proteins are conmposed primarily of 20 d-amino acids. Which one of the following statements is tnue for any of these amino acids in a solution of pH 1.5? (A) Only the amino group is ionized. (B) Only the carboxylic acid group is ionized. (C) Both amino and carboxylic acid groups are ionized. (D) Both amino and carboxylic acid groups are neutral
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Abhijeet Gaurav Best Answer
Answer is (A). Only the Amino group in the form of NH3+ will be in ionized form at pH 1.5. As the COOH loses its H+ at around pH 2. Lowest being of Aspartic acid at pH 1.9 . So the 20 amino acids would have just amino group in ionized form.
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Anup Padwal
Option C 1.5 is very low, at this pH Terminas will be protonated as NH3 and C-terminus in COOH+
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Aditi goud
At pH lower than the physiological pH or pI or in acidic pH, all amino acids show a positive charge which is due to the ionised amino group.