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- 80mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pI. The solution is then titrated with 0.2M HCL 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 relevant pKa value and equivalence point(s)z Relevant pKa values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.ok-Personal Microsoft Edge com/maildeeplink 021 pdt Download Print Save to OneDrive 1. Draw the structure of the pentapeptide Gln-Trp-His-Glu-Tyr that would predominate in aqueous solution at pH3D10.3. (Relevant pka values are: 2.2 4.3, 6.0, 9.8, and 10.1) Acp is adiusted toN H N-H ZI H Saquinavir N H H 1. Identify any single bonds in saquinavir that have restricted rotation and are thus not counted towards the number of rotatable bonds identified for Veber's parameters
- 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 1015You 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.
- Draw the structure of S N-methylpropane-1-amine. Suppoisng that this compound can be isolated in opitcally pure form(enantiomer), then recording its opitcal rotation with a polarimeter a value of [alpha]D=-18° was determined. What will be the optical rotation value recorded after 24h (explanation)?Paper electrophoresis of Asn, Ala, Asp, Lys and Ser mixtures at pH = 7 shows the fastest movement towards the anode The fully saponified 10g oil sample consumed 1.87g KOH, and the iodine value of the oil was 28.3. So how many unsaturated double bonds are there in each oil molecule on average? (lodine is known to have an atomic weight of 127) Given that 100g cellulose sample is completely hydrolyzed to obtain 78g glucose, then the percentage of cellulose in the sample is _% Given that the Km of catalase is 20mmol/L and the substrate concentration is 80mmol/L, then the percentage of catalase bound to the substrate is %Draw dipeptide Arg-Thr at pH 6.0. Circle the six atoms that are restricted in one plane. Calculate its approximate pI assuming pKa for NH3+ is 10.0, pKa for COOH is 3.0, PKR for Arg is 12.0
- 9026238page=9 La-donya 021 Exam Containers Undergraduate Exam Only Containers | S1, 2020/21 EXAM CHEM0901 | S1 2020/21 mistry) ISTRY A If the enthalpy of standard formation enthalpies of CO and CO, are -110 kJ mol and -393.5 kJ mol, respectively, what is the enthalpy change for the reaction? co+1/20 CO. (e) Select one O a 283.5 kJ mo Ob-283.5 kJ mol O C -503.5 kJ mol Od 141 8 k mol 223 pm 10/12/2020 A ENG irsert prt sc delete home 6 8 Y enter H. K pause ctrl alt3 Acra Alrich TOI NOF 200 250 300 350 Wavelength (nm) UV/Vis spectrum of four brands of polysorbate 80, a common detergent used in protein purification. From Wuelfin, et al., "Polysorbate 80 UV/vis spectral and chromatographic characteristics-defining boundary conditions for use of the surfactant in dissolution analysis." 3. While the binding of Coomassie blue to proteins can lead to accurate measurements of protein concentration, there are situations where the absorbance values could be misleading. For example, detergents are often used in the purification of proteins. Certain detergents mixed in with the dye could lead to incorrect determinations of protein concentration. Take a look at the spectrum of the detergent polysorbate 80, above. If you had used this detergent to purify the protein in part c above, would you expect it to interfere with your concentration calculations? Why or why not? Absorbance (AU)Quinine ( 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 =
