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)
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 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-...
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...
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 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,...
Design of PID compensator S. Design of PID (Proportional-plus-Integral and Derivative) Compensator ds/i (st3)(s+6 s+10) and unity feedback Design a PID s+10) An uncompensated system has a gain controller so that the system can operate with a peak time that is two thirds that of the uncompensated system at 20% overshoot and with zero steady-state error for a step input. system has a gain Uncompensated system Compensated system K (s+8 G(s) = (s+3)(s+6)(s+10) ,H(s) = 1 20% OS; desired T,-23a...
1. The pH of a HA/A = 1/10 buffer is (pKa 4.8) (A) 4.8 (B) 5.8 (C) 5.85 (D) 5.9 (E) 6.0 2. Which of the following values is closest to the pH of 10 M NaOH (A) 11 (B) 10 (C) 8 (D) 12 (E) 9 3. The pH of a solution containing 0.01 M HCl plus 0,04M KCIO, is: (The activity coefficient of H' in this solution is 0.86) (A) 2.07 (B) 1.97 (C)3.00 (D) 1.00 (E) 2.04...