Based on the pKa values for the 20 amino acids commonly found in proteins, is th

Question

Based on the pKa values for the 20 amino acids commonly found in proteins, is there any amino acid that could serve as a buffer at pH 8? Correct Answer: yes If so, state which one? Consider the peptides Pro-Leu-Met-Glu-Lys-Arg-Tyrand Lys-Leu-Pro-Tyr-Arg-Glu-Met. How do these two peptides differ? (Select all that apply.) The two peptides have different titration curves. The two peptides differ in amino acid sequence. The two peptides have different isoelectric points. The two peptides have different compositions. Identify the nonpolar amino acids, the acidic amino acids, and the aromatic-group-containing amino acids in the peptide with the following amino acid sequence: MARKALL AS EITHER Acidic Aromatic or Nonpolar Met-Pro-Leu-Ile-Ala-Phe-Asp-Tyr Met Pro: Leu: Ile: Ala: Asp:

Explanation / Answer

Met: non-polar, pro=non-polar

leu: non-polar, Ile:non-polar

Ala: non-polar, phe: non-polar

asp: acid, tyr:polar amino acid

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