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2. (4 points) Multiple choice. Circle the best answer. In anion exchange chromatography, the charge on...
Question 7 1 pts An anion-exchange chromatography is used to purify a protein whose net charge...
Question 7 1 pts An anion-exchange chromatography is used to purify a protein whose net charge is zero when the solution pH is 8.0, what would be the pH of the protein containing solution have to be? Choose the best answer. O 12 0 7 8.9 10 6.0
Biochem help 2 14. What would be the net charge on the dipeptide Ser-His at pH-...
Biochem help 2
14. What would be the net charge on the dipeptide Ser-His at pH- 6.04? (Choose the one best answer.) a) 1.5 b) +1; c) +0.5 d) 0 e) -0.5; 15. The pKa of a lysine side chain in a protein ending up on the outside of a globular protein has a different pKa than if the lysine is buried within the interior of a protein. What would be the expected pKa of a side chain of lysine...
16) At which pH values would two different peptides, one with a pl of 5.9 and...
16) At which pH values would two different peptides, one with a pl of 5.9 and the other with a pl of 9.1, both bind to a cation exchange column? A) pH 3.9 B) pH 7.3 C) pH 10.9 D) None of the above 17) Which type of gel matrix (aka resin) would separate the following proteins using size exclusion chromatography: protein 1 (2,000 Da), protein 2 (7,000 Da), protein 3 (20,000 Da), and protein 4 (90,000 Da)? A) Gel...
(3 points) A Student uses cation exchange chromatography to separate Protein 1 pi9.5) and Protein 2...
(3 points) A Student uses cation exchange chromatography to separate Protein 1 pi9.5) and Protein 2 pl 45). The column is equilibrated using a 20m phosphate buffer, pH 6.0 and then the sample containing Protein 1 and Protein 2 is applied to the column. After the sample is applied to the column, the column is first washed with a low salt buffer. Subsequently, the column is washed with a high salt buffer. The elution profile is shown below. Clearly indicate...
Question1: Multiple Choice: circle the best answer (3 points) 150 mL of an aqueous analyte solution...
Question1: Multiple Choice: circle the best answer (3 points) 150 mL of an aqueous analyte solution is extracted five times with 50 mL of ether (an organic solvent). The partition constant K for the analyte is 1.99. If the starting solution is 1.00 M in analyte concentration, what is the concentration of analyte remaining in the aqueous layer after the 5th extraction? a. (i) 0.07 (ii) 0.12 (iii) 0.19 (iv) 0.22 (v) 0.26 b. Reverse-phase chromatography has what type of...
SIRJE GEL OBJECTIVE: Partial purification of a protein, isocitrate dehydrogenase (IDH), using DEAE ion exchange chromatography....
SIRJE GEL OBJECTIVE: Partial purification of a protein, isocitrate dehydrogenase (IDH), using DEAE ion exchange chromatography. IDH will be eluted from the column using increasing concentrations of KCI. IDH will be tracked using the IDH activity assay and the extent of purification will be analyzed using SDS PAGE Last week we assayed for the activity of the enzyme, isocitrate dehydrogenase, from E.coli strains carrying a plasmid that over-expresses the E. coli IDH gene. To purify proteins from cel extracts, biochemists...
6. You are given a mixture of proteins that you analyze by standard 2-D electrophoresis, with...
6. You are given a mixture of proteins that you analyze by standard 2-D electrophoresis, with the following results for isoelectric points and apparent molecular weights: protein A (Mr 110,400; pl 4.60), protein B (Mr 10,100; pl 6.93), protein C (Mr 65,200; pI 7.84), and protein D (M 25,000; pI 8.15) a. After the 2-D separation, which protein will be in the upper left quadrant of the gel. given that e cathode-proximal end of the isoelectric focusing gel was on...
Multiple Choice (5 points each, 30 points total). Circle the one BEST answer for each problem....
Multiple Choice (5 points each, 30 points total). Circle the one BEST answer for each problem. 1. Which of the following tertiary alcohols cannot be prepared using the reaction of an ester with excess (2 equivalents) Grignard reagent? . Which of the following esters undergoes hydrolysis in basic conditions (saponification) most readily? . Which compound will be essentially unreactive with excess 1-butanol in acid-catalyzed conditions (upon moderate heating if required)? . Which of the following is the best method for...
(iln 2. Use the letters given to answer the questions below for full credit Protein name pl A Non...
(iln 2. Use the letters given to answer the questions below for full credit Protein name pl A Nonheme iron-containing fermitin (Pf) B Pynuvate: ferredoxin oxidoreductase, alpha Subunit (PorA) 44613 CGTP-binding proteia (Gtpl) D Co-chaperone (GiroES) E Adhesin-thiol peroxidase (TagD) FI Fumarase (Fund) 19,155 5.49 5.81 40,444 5.53 12,860 6.59 18,161 8.18 50,844 7.29 i) (5 points) Sketch the Isoelectric focusing gel after the separation of above proteins is performed. Clearly label everything needed for full credit. i) (5 points)...
For multiple-choice questions, circle the letter of the one best answer (unless more than one answer...
For multiple-choice questions, circle the letter of the one best answer (unless more than one answer is asked for) Show your work on free-response questions. Be sure to use proper units and significant figures in your final answers. Organization and neatness count, too. Do NOT use red ink please reserve that color for grading. 3. A thin, hollow metal sphere with a radius of 11.0 cm carries a net charge of-85ЮнС. Location Pi is located 18.0 cm to the right...
Question 7 1 pts An anion-exchange chromatography is used to purify a protein whose net charge is zero when the solution pH is 8.0, what would be the pH of the protein containing solution have to be? Choose the best answer. O 12 0 7 8.9 10 6.0
Biochem help 2
14. What would be the net charge on the dipeptide Ser-His at pH- 6.04? (Choose the one best answer.) a) 1.5 b) +1; c) +0.5 d) 0 e) -0.5; 15. The pKa of a lysine side chain in a protein ending up on the outside of a globular protein has a different pKa than if the lysine is buried within the interior of a protein. What would be the expected pKa of a side chain of lysine...
16) At which pH values would two different peptides, one with a pl of 5.9 and the other with a pl of 9.1, both bind to a cation exchange column? A) pH 3.9 B) pH 7.3 C) pH 10.9 D) None of the above 17) Which type of gel matrix (aka resin) would separate the following proteins using size exclusion chromatography: protein 1 (2,000 Da), protein 2 (7,000 Da), protein 3 (20,000 Da), and protein 4 (90,000 Da)? A) Gel...
(3 points) A Student uses cation exchange chromatography to separate Protein 1 pi9.5) and Protein 2 pl 45). The column is equilibrated using a 20m phosphate buffer, pH 6.0 and then the sample containing Protein 1 and Protein 2 is applied to the column. After the sample is applied to the column, the column is first washed with a low salt buffer. Subsequently, the column is washed with a high salt buffer. The elution profile is shown below. Clearly indicate...
Question1: Multiple Choice: circle the best answer (3 points) 150 mL of an aqueous analyte solution is extracted five times with 50 mL of ether (an organic solvent). The partition constant K for the analyte is 1.99. If the starting solution is 1.00 M in analyte concentration, what is the concentration of analyte remaining in the aqueous layer after the 5th extraction? a. (i) 0.07 (ii) 0.12 (iii) 0.19 (iv) 0.22 (v) 0.26 b. Reverse-phase chromatography has what type of...
SIRJE GEL OBJECTIVE: Partial purification of a protein, isocitrate dehydrogenase (IDH), using DEAE ion exchange chromatography. IDH will be eluted from the column using increasing concentrations of KCI. IDH will be tracked using the IDH activity assay and the extent of purification will be analyzed using SDS PAGE Last week we assayed for the activity of the enzyme, isocitrate dehydrogenase, from E.coli strains carrying a plasmid that over-expresses the E. coli IDH gene. To purify proteins from cel extracts, biochemists...
6. You are given a mixture of proteins that you analyze by standard 2-D electrophoresis, with the following results for isoelectric points and apparent molecular weights: protein A (Mr 110,400; pl 4.60), protein B (Mr 10,100; pl 6.93), protein C (Mr 65,200; pI 7.84), and protein D (M 25,000; pI 8.15) a. After the 2-D separation, which protein will be in the upper left quadrant of the gel. given that e cathode-proximal end of the isoelectric focusing gel was on...
Multiple Choice (5 points each, 30 points total). Circle the one BEST answer for each problem. 1. Which of the following tertiary alcohols cannot be prepared using the reaction of an ester with excess (2 equivalents) Grignard reagent? . Which of the following esters undergoes hydrolysis in basic conditions (saponification) most readily? . Which compound will be essentially unreactive with excess 1-butanol in acid-catalyzed conditions (upon moderate heating if required)? . Which of the following is the best method for...
(iln 2. Use the letters given to answer the questions below for full credit Protein name pl A Nonheme iron-containing fermitin (Pf) B Pynuvate: ferredoxin oxidoreductase, alpha Subunit (PorA) 44613 CGTP-binding proteia (Gtpl) D Co-chaperone (GiroES) E Adhesin-thiol peroxidase (TagD) FI Fumarase (Fund) 19,155 5.49 5.81 40,444 5.53 12,860 6.59 18,161 8.18 50,844 7.29 i) (5 points) Sketch the Isoelectric focusing gel after the separation of above proteins is performed. Clearly label everything needed for full credit. i) (5 points)...
For multiple-choice questions, circle the letter of the one best answer (unless more than one answer is asked for) Show your work on free-response questions. Be sure to use proper units and significant figures in your final answers. Organization and neatness count, too. Do NOT use red ink please reserve that color for grading. 3. A thin, hollow metal sphere with a radius of 11.0 cm carries a net charge of-85ЮнС. Location Pi is located 18.0 cm to the right...
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