A galactosidase from E. coli has a molecular weight of 650 000 Da and a molar extinction coefficient of 1.3 x 10^5 (L/mole x cm). The A280 for your sample was 0.822. What was the mass concentration (in %) of your original sample? The molar concentration was %. (Round to 3 decimal points)
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- A protein sample of unknown concentration was placed in a cuvette with a path length of 1 cm and the sample was found to have an A280 value of 2.92. If the protein of interest has an extinction coefficient of 44240 M-1 cm-1 and the molecular weight of the protein is 47.411 kDa, what is the concentration of protein in mg/mL?Scenario: First, 0.1 mL of the unknown is mixed with 0.1 mL of distilled water. Then, 0.1 mL of the solution and 0.9 mL of distilled water are mixed in a cuvette and the absorbance is measured at 410 nm. Given the absorbance, molecular mass and the extinction coefficient of the unknown are 0.650, 16950 g and 188 mM-1cm-1 respectively, and the path length is 1 cm, how can I find the original concentration of the unknown in mg/mL by Beer-Lambert Law (NOT molarity M)?What type of mass spectrometer can determine the structure and molecular weight of a compound like quercetin? Explain the principle behind this MS.
- Phosphorus-32, a radioisotope used in leukemia therapy, has a half-life of about 14 days. Approximately what percentage of a sample remains after eight weeks?Dihedral angles of Phe165 of 4KW4 betasheet values are consistent with what is expected from the Ramachandran Plot?Why is it possible for the ΔG values in Table to differ from the ΔG°′ values?
- You assay 0.5 ml of 1/2000 diluted egg white for protein, as described in the practical schedule, and the spectrophotometer reading at 595 nm is 0.6. Using the attached calibration curve(click to enlarge), calculate the concentration of protein in undiluted egg white. Give your answer in mg/ml.Using the equation for the best-fit straight line through your data, the average absorbance of your unknown samples U1 and U2, and any dilution factors (DON’T LEAVE OUT THE DILUTION FACTOR), calculate the concentration of protein in the original unknown protein sample. y = 1.6849x + 0.0414R² = 0.9904The Ksp values of silver chromate Ag2CrO4 and silver iodate Ag(IO3) are given below. Ag2CrO4 Ag(IO3) Ksp 1.12 x 10-12 3.17 x 10-8 Based on these Ksp values, which of the following is true? Choose one option only. Options: a. In the solution consisting of 1.00 x10-4 M Ag+ and 5.00 x10-5 M CrO42-, Ag2CrO4 precipitate will form. b. In the solution consisting of 1.0 x10-4 M Ag+ and 1.0 x10-4 M IO3-, Ag(IO3) precipitate will form. c. In pure water, the solubility of Ag2CrO4 is lower than the solubility of Ag(IO3). d. In the solution consisting of 0.200 M CrO42- and 0.200 M IO3-, Ag2(CrO4) will precipitate first if we add Ag+ ions gradually into the above mixture.
- Five amino acids were subjected to reverse phase chromatography, and the following Rf values were computed: A - 0.23 B - 0.08 C - 0.54 D - 0.74 E - 0.96 Which is the most polar amino acid? Group of answer choices E D B C AWhat is the molecular weight of the Botulinum neurotoxin, a protein that contains 1350 amino acids? Assume an average distribution of amino acidsFive amino acids were subjected to reverse phase chromatography, and the following Rf values were computed: A - 0.23 B - 0.08 C - 0.54 D - 0.74 E - 0.96 Which is the most polar amino acid?