8. Which of the following amino acids has a net charge of +2 at low pH? Which has a net charge of -2 at high pH? Asp, alanine, R, glutamic acid, Leu, lysine.

Chemistry: Principles and Reactions
8th Edition
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Author:William L. Masterton, Cecile N. Hurley
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Chapter23: Organic Polymers, Natural And Synthetic
Section: Chapter Questions
Problem 31QAP: On complete hydrolysis, a polypeptide gives two alanine, one leucine, one methionine, one...
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8. Which of the following amino acids has a net charge of +2 at low pH? Which has a net
charge of -2 at high pH? Asp, alanine, R, glutamic acid, Leu, lysine.
9. Identify the polar amino acids, the aromatic amino acids, and the sulfur containing amino
acids, given a peptide with the following amino acid sequence:
Val - Met - Ser - Ile - Phe - Arg-Cys- Tyr- Leu
10. Predict the predominant ionized forms of the following amino acids at pH 2.0: glutamic
acid, Leu, threonine, His, and arginine.
11. Draw structures of the following amino acids, indicating the charged form that exists at
pH 4; histidine, asparagine, tryptophan, proline, and tyrosine.
Transcribed Image Text:8. Which of the following amino acids has a net charge of +2 at low pH? Which has a net charge of -2 at high pH? Asp, alanine, R, glutamic acid, Leu, lysine. 9. Identify the polar amino acids, the aromatic amino acids, and the sulfur containing amino acids, given a peptide with the following amino acid sequence: Val - Met - Ser - Ile - Phe - Arg-Cys- Tyr- Leu 10. Predict the predominant ionized forms of the following amino acids at pH 2.0: glutamic acid, Leu, threonine, His, and arginine. 11. Draw structures of the following amino acids, indicating the charged form that exists at pH 4; histidine, asparagine, tryptophan, proline, and tyrosine.
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