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Describe the behavior of a mixture of glutamic acid, arginine, and valine on paper electrophoresis at pH 6.0.
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- What are the different technical considerations in performing the serum protein electrophoresis method? What should be done to obtain acceptable performance?.Are the number of spots shown on SDS-PAGE electrophoresis dependant on whether the protein is a monomer or tetramer?What are the basic medium, acid medium, and zwitterion formulas of phenylalanine?
- Write with the reasons why a separation will occur when a mixture of polypeptides with isoelectric points 4,3, 8,7 and 9,2 is applied to a column containing an anion-exchanging filler.A protein with a pI of 7.5 will be purified using ion-exchange chromatography. Which ion exchange resin is suitable to use if the buffer has a pH of 7.0?a. A resin with a quaternary amino groupb. A resin with sulfonic acid groupc. A resin containing primary aromatic/aliphatic amino groupd. A resin that has carboxylic acid groupThe isoelectric point of tyrosine is 5.63. Toward which electrode does tyrosine migrate on paper electrophoresis at pH 7.0?
- 1. A mixture of proteins (pepsinogen, myoglobin, and cytochrome c) is subjected to anion exchange chromatography at pH 5.0. In what order would the following proteins be eluted from the DEAE cellulose anion exchanger by an increasing salt gradient: cytochrome c (pl, 10.6), pepsinogen (pl, 1.0) and myoglobin (pl, 6.8)How does the shape of a titration curve confirm the fact that the pH region of greatest buffering power for an amino acid solution is around its pK's? Name four factors (bonds or other forces) that contribute to stabilizing the native structure of a protein, and describe one condition or reagent that interferes with each type of stabilizing force. Why is silk fibroin so strong, but at the same time so soft and flexible?Describe the following gel matrices used in gel filtration chromatography and discuss the types of sample used for each. a. Dextran gels b. Agarose gels
- For the three tripeptides TED, RAY and ALI, determine in which order they will be eluted at pH 7.0 from cation exchange chromatography column.An unretained solute is eluted from a GC column in 1.80 min. Decane (C10H22) is eluted in 15.63 min and undecan (C11H24) is eluted in 17.22 min. What is the retention time (report to 2 decimal places, in minutes) of a compound whose retention index is 1050?Look up the pKa values for trimethylamine, dimethylamine, ethylamine, and ammonia. Predict the order of elution of these compounds from a cation-exchange column eluted with a gradient of increasing pH, beginning at pH 7.
