The sulfhydryl sidechain of cysteine exists as -SH, which can dissociate to become -S:- plus H+...
The sulfhydryl sidechain of cysteine exists as -SH, which can dissociate to become -S:- plus H+ with a pKa = 9. The dominant forms at pH 2 and pH 8 are _
A)-SH (pH 2) ; 50/50 -SH/-S:- (pH 8)
B)-SH (pH 2) ; -S:- (pH 8)
C)-S:- (pH 2) ; -SH (pH 8)
D)-S:- (pH 2) ; -S:- (pH 8)
E)-SH (pH 2) ; -SH (pH 8)
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The sulfhydryl sidechain of cysteine exists as -SH, which can
dissociate to become -S:- plus H+...
1) The pKa for the imidazole group in histidine in Papain's catalytic centers is 8.3. What...
1) The pKa for the imidazole group in histidine in Papain's catalytic centers is 8.3. What is the ratio of protonated and deprotonated His-R groups at pH 8.2? a) 5 NH+ / 4 N: b) 1 NH2+ / 1 NH c) 4 N: / 5 NH+ d) 1 NH / 1 NH2+ 2) What is the ratio of protonated vs deprotonated Cysteine sulfhydryl groups in the catalytic center of papain, pKa 3.4, at optimal pH of 6.2? a) 1 S-...
Calculate the net charge of a peptide sequence W-S-N-G-C-H (all connected : Tryptophan-Serine-Asparagine-Glycine-Cysteine-Histidine) pKa values at...
Calculate the net charge of a peptide sequence W-S-N-G-C-H (all connected : Tryptophan-Serine-Asparagine-Glycine-Cysteine-Histidine) pKa values at (a) pH 2.0, (b) 6.0 (c) 7.0 and (d) 11.5. Assuming the ionisable groups have pKa values of His 6.0, Asp 3.6, Tyr 10.0, Cys 8.3, Arg 12.5, Lys, 10.5, Glu 4.3 C-term -COOH 2.0, N-term -NH3 + 9.5.
Phosphoric acid is a tri-protic acid, which can dissociate three different protons at three different pka’s....
Phosphoric acid is a tri-protic acid, which can dissociate three different protons at three different pka’s. These pka values are 2.13, 7.20 and 12.36. 1a. Provide the chemical equation that describes the phosphoric buffer system that exists at pH 8! Indicate the weak acid and it’s conjugate base, and the names of the components. H2PO4- (aq) <=> H+ (aq) + HPO42- (aq) pKa2 = 7.20 The weak acid is dihydrogen phosphate, H2PO4- (as the sodium or the potassium salt) and...
Answer the following questions. For calculations, show all work. You may attach another sheet of paper (2 pt) 1. Li...
Answer the following questions. For calculations, show all work. You may attach another sheet of paper (2 pt) 1. List all of the amino acids that have side chains that fit into each of the following categories: a. acidic: b. basic: c. nonpolar aromatic: d. sulfur-containing: e. hydroxyl-containing: f. achiral: (2 pt) 2. Protein Lengths. Calculate the length of a 80 amino acid-long stretch of protein if: a. It consists of pure a-helices: b. It consists of pure β strands:-...
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group that can be positively charged or lose a proton to become neutral. The pKa of the amino...
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group that can be positively charged or lose a proton to become neutral. The pKa of the amino group is 10.8. Determine the fraction of amino group that is protonated at pH 9.8 and at pH 11.8.
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group...
Which of the following amino acids can form hydrogen bonds through their sidechain groups? Select one: a. Threonine b. P...
Which of the following amino acids can form hydrogen bonds through their sidechain groups? Select one: a. Threonine b. Phenylalanine c. Proline d. Methionine e. Glycine
8:50 Question 3 of 36 Submit Which one of the following will dissociate into the largest...
8:50 Question 3 of 36 Submit Which one of the following will dissociate into the largest number of ions in solution? A) Li2SO4 B) KI C) LiC2H302 D) Na3PO4 E) C6H12O6 Tap here or pull up for additional resources
Question #6 Given the following logk values SO2- + H+ + S + H2O logk-6.03 130.2-...
Question #6 Given the following logk values SO2- + H+ + S + H2O logk-6.03 130.2- + H+ + = H,S() + H20 logk 5.25 SO2- + H+ + = HS + H2O logk-4.25 Sw) + H+ +e- = H,Sw logK-2.89 H+ + = H2(8) logk-0.00 pka2 H2SO4 = 2.00 (note pka is completely strong for sulfuric acid) pka1 H2S = 7.00 (you can ignore pka2). label the pe-pH diagram and determine the equations of the 7 lines. a 0...
Which letters correspond to which Hs? 6. 'H-NMR OTBS SH 1 H NMR (400 MHz, CDC13)...
Which letters correspond to which Hs?
6. 'H-NMR OTBS SH 1 H NMR (400 MHz, CDC13) A= 9.39 (s, 1H), B= 6.66 (dd, J = 9.9, 1.3 Hz, 1H), 6.66 (dd, J = 9.9, 1.3 Hz, 1H), C= 3.45 (dd, J = 5.1, 3.2 Hz, 1H), D=2.94 -2.84 (m, 1H) E= 1.75 (d, J = 1.3 Hz, 3H), 1.73 - 1.67 (m, 1H), 1.04 (d, J = 7.0 Hz, 3H), F= 0.92 (s, 9H), 0.88 (d, J = 6.9 Hz,...
Answer the following questions. For calculations, show all work. You may attach another sheet of paper (2 pt) 1. List all of the amino acids that have side chains that fit into each of the following categories: a. acidic: b. basic: c. nonpolar aromatic: d. sulfur-containing: e. hydroxyl-containing: f. achiral: (2 pt) 2. Protein Lengths. Calculate the length of a 80 amino acid-long stretch of protein if: a. It consists of pure a-helices: b. It consists of pure β strands:-...
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group that can be positively charged or lose a proton to become neutral. The pKa of the amino group is 10.8. Determine the fraction of amino group that is protonated at pH 9.8 and at pH 11.8.
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group...
8:50 Question 3 of 36 Submit Which one of the following will dissociate into the largest number of ions in solution? A) Li2SO4 B) KI C) LiC2H302 D) Na3PO4 E) C6H12O6 Tap here or pull up for additional resources
Question #6 Given the following logk values SO2- + H+ + S + H2O logk-6.03 130.2- + H+ + = H,S() + H20 logk 5.25 SO2- + H+ + = HS + H2O logk-4.25 Sw) + H+ +e- = H,Sw logK-2.89 H+ + = H2(8) logk-0.00 pka2 H2SO4 = 2.00 (note pka is completely strong for sulfuric acid) pka1 H2S = 7.00 (you can ignore pka2). label the pe-pH diagram and determine the equations of the 7 lines. a 0...
Which letters correspond to which Hs?
6. 'H-NMR OTBS SH 1 H NMR (400 MHz, CDC13) A= 9.39 (s, 1H), B= 6.66 (dd, J = 9.9, 1.3 Hz, 1H), 6.66 (dd, J = 9.9, 1.3 Hz, 1H), C= 3.45 (dd, J = 5.1, 3.2 Hz, 1H), D=2.94 -2.84 (m, 1H) E= 1.75 (d, J = 1.3 Hz, 3H), 1.73 - 1.67 (m, 1H), 1.04 (d, J = 7.0 Hz, 3H), F= 0.92 (s, 9H), 0.88 (d, J = 6.9 Hz,...
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