1. Shown below is the chromatogram for some amino acid standards and two unknowns. Each unknown consists of just a single amino acid. Answer the following questions based on this chromatogram. Solvent Frort Urkx Unk Y Ala Ser Asp a) Explain the trend in the distances travelled by the standard amino acids. b) Calculate the R;values of the standard amino acids and the two unknowns. Show your computations. c) Based on your calculations, what are X and Y? d) Are you able to identify X unambiguously? How about Y? e) If you are unable to identify either one of the unknown amino acids, think of a method by which you can separate them from each other. Explain your answer.

1. Shown below is the chromatogram for some amino acid standards and two unknowns. Each unknown consists of just a single amino acid. Answer the following questions based on this chromatogram. Solvent Frort Urkx Unk Y Ala Ser Asp a) Explain the trend in the distances travelled by the standard amino acids. b) Calculate the R;values of the standard amino acids and the two unknowns. Show your computations. c) Based on your calculations, what are X and Y? d) Are you able to identify X unambiguously? How about Y? e) If you are unable to identify either one of the unknown amino acids, think of a method by which you can separate them from each other. Explain your answer.

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Similar questions

1. Complete the table below with information about the amino acids utilized in this pro- cedure. Remember that smaller amino acids will travel further and so will amino acids that are soluble in the solvent. Table 9-1. Amino Acids Procedure AMINO ACIDS Phenylalanine Aspartic Acid Leucine Proline matemps DRAW THE MOLECULAR STRUCTURE in POLARITY (IS IT POLAR OR NONPOLAR?) odme her basalu la MOLECULAR WEIGHT SIZE (RANK LARGEST = 4 AND SMALLEST = 1) SHOULD IT REACT WITH NINHYDRIN?
1.0.1 mL of a protein solution of concentration of 11 mg/mL was diluted to a total volume of 4.0 mL with water (i.e. 0.1 mL of the solution was added to 3.9 mL of water). 2 mL of this solution was then mixed with 18 mL of water. What is the concentration of the diluted protein solution? Space to show your workings:
1)Ubiquitin is a small protein with a monoisotopic mass of 8560 Da. a) Electrospray ionization of this small protein typically results in major charge states of +8, +9, +10, +11, +12, and +13. Using this information, complete the table below, assuming the charges on each come from protonation. Report mass and m/z values to the ones place. b) Using the data you entered in the table, sketch an expected ESI-MS spectrum for ubiquitin. Label each peak with its charge state. What do you notice about the spacing of peaks along the x-axis. c)The figure shows an experimentally obtained electrospray mass spectrum for ubiquitin. Compare this spectrum to the spectrum you predicted. Are there any differences? If so, what might cause these differences?
calculate the volume of stock solutions required to make up the buffer solutions that will be used for protein purification. The solutions you need to prepare for purification are: i. Binding Solution A: make up 50 mL 50 mM HEPES buffer (pH 7.5), 300 mM NaCl, 5mM imidazole, 5% (v/v) glycerol ii. Wash Solution B: make up 50 mL 50 mM HEPES buffer (pH 7.5), 300 mM NaCl, 75mM imidazole, 5% (v/v) glycerol iii. Elution Solution C: make up 10 mL 50 mM HEPES buffer (pH 7.5), 300 mM NaCl, 500 mM imidazole, 5% (v/v) glycerol please show your working . Thnk you
A stock solution contains 0.2 mg/mL protein. From this stock solution, 179 uL is diluted with 1.1 mL buffer. What is the concentration of protein in this dilution?
The following proteins were separated by SDS-PAGE in the presence of mercaptoethanol. Sketch the relative positions of the various polypeptides on the gel. Label the positive and negative ends of the gel.Protein A: 40 kDa single polypeptideProtein B: 80 kDa protein, made up of two subunits of molecular weight 20 kDa and 60 kDa, held together by noncovalent interactionsProtein C: 200 kDa protein, made up of four identical subunits (50 kDa each) linked together by disulfide bonds
After staining an SDS-PAGE gel with Coomassie Blue G-250, the protein bands are visualized by de-staining the gel in a Coomassie Blue G-250 de-staining solution. This solution is made up of 10% acetic acid, 50% methanol, and 40% distilled water. How much of each of these components do you need to prepare 5 liters of Coomassie Blue G-250 de-staining solution?
You are working at a major pharmaceutical company, and you have purified an engineered enzyme, and you need to determine the protein stability (kJ/mol). Accordingly, you have collected equilibrium unfolding data using the chemical denaturant urea at 20°C, pH 7.5 and I atmosphere using fluorescence spectroscopy. a) Determine the protein stability (AG [kJ/mol]) via nonlinear least squares (using the available data). b) Write the partial differential equation (i.e., general functional form, variable, constants). c) Describe what would happen to the isotherm if the temperature was increased to 25 °C. Urea [M] 0 0.25 0.5 0.75 1 1.25 1.5 2 2.25 2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5 FL 340nm 316 315.5 315 314.5 314 315 300 275 225 125 75 60 55 54 53 52.5 52.25 52 51.75 51.5 dG = Vdp-SdT+μA dnд + μB dng dGp = μA dnA+ μg dng A = Folded State B = Unfolded State
7. You want to separate these four proteins in a mixture: Isoelectric point Mol. Weight (kDa) Protein A 4.1 80 Protein B 9.0 81 Protein C 8.8 37 Protein D 3.9 172 Which of the following would be the best order in which to run chromatography columns? A) Anion-exchange at pH 3, then size exclusion B) Cation-exchange at pH 3, then size exclusion C) Cation-exchange at pH 3, then anion-exchange at pH 3 D) Anion-exchange at pH 3, then cation-exchange at pH 3 E) Size exclusion, then cation-exchange at pH 3 F) Size exclusion, then anion-exchange at pH 3
A purified protein fraction has a total sample volume of 360 µL. The sample has a corrected A280 of 0.484, and the blank corrected A280 was 0.052. (Both values were measured with a path length of 1.00 cm.) If 5.00 µL of the sample was used in a reaction, calculate the mass of protein in the reaction (in µg).