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- 80mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pl. The solution is then titrated with 0.2M HCI to a final pH of 2.1. Sketch the titration curve, labelling the pH and volume axes. Indicate the volume of HCl needed to reach each relevant pKa value and equivalence point(s). Relevant pka values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.6-26. Given the following equilibria, calculate the concentration of each zinc species in a solution saturated with Zn(OH),(s) and containing [OH ] at a fixed concentration of 3.2 x 10-7 M. Zn(OH),(s) Kp = 3 × 10 16 Zn(OH) B1 = 1 × 104 Zn(OH),(aq) B2 = 2 × 1010 Zn(OH), Zn(OH); B3 = 8 × 1013 2- ВA — 3х 1015Quinine ( C20 H24 N2 O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine, pK, = 5.1 and pK, = 9.7 ( pKp = – log Kp). Only 1 g quinine will dissolve in 1920.0 mL of solution. Calculate the pH of a saturated aqueous solution of quinine. Consider only the reaction | Q+ H2O= QH+ + OH- described by pK, where Q = quinine. pH =
- Ph Level given: Acetic Acid = pH value of 3 Monocholoroacetic Acid = pH value of 2 Acetamide = pH value of 6 Acetone = pH value of 5.5 Glycine= pH value of 6 Lysine = pH value of 7.2 Isopropyl alcohol = pH value of 6 Phenol = pH value of 5.1 Compare the pH value of the following compounds: (explain in 3 sentences each) a. Acetic Acid and Monochloroacetic Acid b. Acetamide and Acetone c. Glycine and Lysine d. Isopropyl alcohol and PhenolpKal 2.19 pKa2 9.67 pKa3 4.25 Amino acid Glutamic acid Threonine |Isoleucine Arginine 2.63 2.36 2.17 9.10 9.68 9.04 12.48 Draw the predominant ion of glutamic acid at its pl. Given the R group of glutamic acid is CH,CH,COOH. (ii) Draw a tripeptide of Gly-Ser-Val. Also indicate in the structure the peptide bond, N-terminus and C-terminus. (R groups for Gly, Ser, and Val is H, CH,OH and CHCH;CH; respectively).I. Write a balanced chemical reaction, complete with chemical structures, to show the hydrolysis of iso-C to U. II. Draw the mechanism by which iso-G converts to its "minor tautomeric form complementary to U." You may propose either an acid or base catalyst. III. Draw chemical structures of the minor tautomeric form of iso-guanine (iso-G) and uracil (U), showing the non-covalent bonding (H-bonding) interactions between them.
- Size Size Crude Anion Cation 2) Exclusion Exclusion Lysate Exchange Exchange 1 2 Total Protein Concentration 15.2 6.6 2 3.75 4.7 (mg/mL) Final Sample Volume 60 30 20 4 3 (mL) Enzyme Specific Activity 0.43 1.7 7.25 18.3 12.5 (units/mgprotein) Based on your protein purification sample data, in which of the purification steps in your protocol did you effectively purify your enzyme? Select all that apply. a) anion exchange correct b) cation exchange correct c) size exclusion 1 correct d) size exclusion 25/ n SO a- 6.46 The following data show the binding of Mg2+ ions with a protein containing n equivalent sites: [Mg2+ ] total/μM [Mg2+ ]free/μM 108 Com 35 180 65 288 501 115 248 752 446 Apply the Scatchard plot to determine n and Ka. The protein concentration is 98 µM.Based on the following titration table of Glycine, would you be able to recreate the same for Histidine? Glicina Increasing pH H-N-CH,-COOH -H-N-CH,-co = H-N-CH,-C00- Net charge: +1 pH COOH-pKa = 2.3 NH3-pka = 9.6 CN AEq +1 +1 2.3 (0.5°-1)+(0.5°0)=-0.5 +0.5 0.5 9.6 -1 (0.5*+1)+(0.5°0)=+0.5 -0.5 1.5 14 Given that the pKas for Histidine are the following: pka1 = 1.82 pKa2 = 9.17 pКаз %3 6.00 pL = 7.59 2.
- You are trying to separate study Fibrinogen variants with a pl approximately 5.8. Which ion exchange resin would you use under the different conditions proposed? O Carboxymethyl at pH=2.8 O Alkylsulfonyl at pH=7.0 O DEAE at pH = 7.0 O Quaternary alkylammonium resin at pH=2.8 O DEAE and Carboxymethyl approaches could both work.Consider the following dipeptides: AC HE TG LR VK How many of the dipeptides in this group that would stick to an anion exchange column at pH-8? Please give me the whole number as the answer, 0, 1, 2 etc Amino Acid pKac pKaN pKaR 9.8 9.9 97 2.4 Glycine Alanine 23 Valios 222Given the titration curve of the hypothetical polyprotic acid X at 0.100 M concentration (pKa1=4.0, pKa2=8.0, pKa3=12.0) titrated with 0.600 M NaOH, identify the pH at point C, H, E, and M.