Homework Answers
Solution:
5.56) Isoelectric point (pI) is calculated from pka's as:
pI = (pka1 + pka2) / 2
Thus,
For proline:
pka1 = 1.99
pka2 = 10.60
Thus,
pI = (1.99 + 10.60) / 2 = 6.295 = 6.3
Therefore, proline has pI closest to pH of water.
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TABLE 5.1 PK values for amino acids 2.36 Amino acid Alanine Arginine Asparagine Aspartic acid Cysteine...
(1) The following diagram represents a titration curve of histidine as pH increases; pKa = 1.82 represents the terminal carboxylic acid group. pK, represents the terminal amino group: 6.0 r...
(1) The following diagram represents a titration curve of histidine as pH increases; pKa = 1.82 represents the terminal carboxylic acid group. pK, represents the terminal amino group: 6.0 represents the R-group, and pK, E 9.17 7.59 pH 182 3.0 20 10 H (equivalents) At what point on the diagram is histidine predominantly present as the following species? COO A, at pH < 1.82 B. between pH 1.82 and pH 6.0 C) between pH 6.0 and pH 9.17 D. at...
xz1. Estimate the pl to the tenths' place for the following small protein: EDNQGAILP iation/ M,...
xz1. Estimate the pl to the tenths' place for the following small protein: EDNQGAILP iation/ M, (-COOH) -NH) (R group) 9.60 75 89 115 2.34 9.69 10.96 2.34 1.99 9.62 9.60 2.32 2.36 131 9.68 2.36 131 149 9.21 2.28 1.83 9.13 165 10.07 9.11 9.39 2.20 2.38 181 204 W 2.21 9.15 105 119 9.62 10.28 8.80 9.13 2.11 8.18 1.96 2.02 121 132 146 2.17 0.53 6.00 8.95 2.18 146 155 174 1.82 9.17 12.48 9.04 2.17 3.65...
Name Standard Reduction Potentials of Some Biologically Important Half-Reactions TABLE 13-7 Amino...
Name Standard Reduction Potentials of Some Biologically Important Half-Reactions TABLE 13-7 Amino acids pki k2 pkR Half-reaction 2.34 9.60 2.34 9.69 1.99 10.96 2.32 9.62 2.36 9.60 2.36 9.68 Ubiquinone + 2H+ + 2e-→ ubiquinol + H: 0.045 Fumarate:-+ 2H. + 2e-→ succinate"- 2H+ + 2e-→ H2 (at standard conditions, pH 0) 0.000 Crotonyl-CoA+2H +2butyryl-CoA0.015 Oxaloacetate:-+ 2H+ + 2e-→ malate"--0.166 Pyruvate +2H2elactate Acetaldehyde + 2H+ + 2e-→ ethanol FAD +2HFADH2 Glutathione + 2H+ + 2e- Alanine Proline 0.031 228 921...
C,D, and E i need help with. 17. The following peptide forms part of Human Hemoglobin...
C,D, and E i need help with.
17. The following peptide forms part of Human Hemoglobin subunit gammaa Asp-Leu-Lys-Gly-Thr-Phe-Ala A) Which amino acids are likely to be on the side of peptid acids are likely to be on the side of peptide that faces the interior of the protein? Insert your answer leu, Gto.Pne, Ala B) Which are likely to be facing the aqueous environment? Insert your answer Asp, lys, Thr Draw the structure of the sequence at pH7.4. Using...
(1) The following diagram represents a titration curve of histidine as pH increases; pKa = 1.82 represents the terminal carboxylic acid group. pK, represents the terminal amino group: 6.0 represents the R-group, and pK, E 9.17 7.59 pH 182 3.0 20 10 H (equivalents) At what point on the diagram is histidine predominantly present as the following species? COO A, at pH < 1.82 B. between pH 1.82 and pH 6.0 C) between pH 6.0 and pH 9.17 D. at...
xz1. Estimate the pl to the tenths' place for the following small protein: EDNQGAILP iation/ M, (-COOH) -NH) (R group) 9.60 75 89 115 2.34 9.69 10.96 2.34 1.99 9.62 9.60 2.32 2.36 131 9.68 2.36 131 149 9.21 2.28 1.83 9.13 165 10.07 9.11 9.39 2.20 2.38 181 204 W 2.21 9.15 105 119 9.62 10.28 8.80 9.13 2.11 8.18 1.96 2.02 121 132 146 2.17 0.53 6.00 8.95 2.18 146 155 174 1.82 9.17 12.48 9.04 2.17 3.65...
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C,D, and E i need help with.
17. The following peptide forms part of Human Hemoglobin subunit gammaa Asp-Leu-Lys-Gly-Thr-Phe-Ala A) Which amino acids are likely to be on the side of peptid acids are likely to be on the side of peptide that faces the interior of the protein? Insert your answer leu, Gto.Pne, Ala B) Which are likely to be facing the aqueous environment? Insert your answer Asp, lys, Thr Draw the structure of the sequence at pH7.4. Using...
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