1.) A sample contains 0.003 mg of NaOH. How many micrograms (μg) is this? 2.) An experiment was performed in which 400 mL of 0.2 M urea was used. Calculate the number of millimoles (mmol) of urea contained in this sample. 3.) How many micromoles (μmol) of ATP are present in 4 mL of 5 mM ATP solution..
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1.) A sample contains 0.003 mg of NaOH. How many micrograms (μg) is this?
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- The standard curve to determine the amount of betacyanin is shown below. You extracted a red pigment from a beet disc (the mass of a disc is 2 g) using 10 ml of 20% ethanol solution. You measured absorbance of the solution above the beet disc every minute for a total time of 20 minutes. The increase in absorbance was linear during a period of time from 1 min to 10 min. The absorbance at 10 min was 0.8. Calculate the amount of betacyanin extracted from 1g of a beet tissue per minute. Explain your calculations. You can use Excel or a calculator.Consider a buffer solution of acetate. The volume is 500 ml, the concentration is 200 mM, and the pH is 5.0. a. How many total moles of acetate plus acetic acid are present in the solution? Express answer as x.y with one digit before and one after the decimal place. b. What is the ratio of acetate ions (Ac-) to acetic acid ions (HAc) in the buffer solution (pH 5.0) if the pka is 4.76? Express the answer as x.yz with one digit before and two after the decimal place. c. How many moles of acetate are present in the solution? Express your answer to one decimal place. d. How many moles of acetic acid are present in the solution? Express your answer to one decimal place.How many mL of the 1 M glucose stock solution do you need to prepare 100 mL of a 1 mM glucose solution?
- You have a stock solution containing 1.5 mM of substrate in borate buffer pH 9.5. You transfer 1.25 mL of this stock into a cuvette and then add 250 µl of enzyme solution to initiate the reaction. What will be the final concentration of substrate in the cuvette following addition of the enzyme? 1.5 mM 1.25 mM 0.0075 mM 7.5 mM 1250 mMA glucosamine solution of unknown concentration was diluted as follows: 1 mL of the solution was diluted to 5.0 mL. A 0.3 mL aliquot of this solution was diluted with 0.7 mL of water; the absorbance of this was measured and found to be 0.440 (uncorrected, must subtract blank). What is the concentration of the original undiluted glucosamine hydrochloride solution in µmol/mL? Given: Corrected absorbance = 0.395 y= 1.165x+0.055 Standard equationA researcher prepares 100 mL of aqueous solution containing 0.1 g of a protein. The researcher then uses an experimental apparatus ,where he notes that, at room temperature (300K) and atmospheric pressure (101.325 kPa), distilled water flows naturally into the solution compartment. However, when he applies an extra pressure of 1000 Pa he observes that the flow of distilled water ceases and the system is in balance. Calculate the molar mass of this protein, in kDa (1 Da = 1 g/ mol); Why does the flow of distilled water cease with the application of the pressure of 1000 Pa? Explain in terms of potential chemicals. %3D
- Laemmli buffer, also referred to as SDS-reducing buffer, is added to each of the samples. It is a blue solution and the recipe for 2X Laemmli buffer is: 0.125 M Tris HCl, pH 6.8, 20% glycerol, 4% SDS and 10% β-mercaptoethanol (βME). What is the purpose of each of these ingredients?A purified protein sample was used in a reaction, resulting in an activity of 696.7 nmol min-1. The reaction volume was 145.0 µL and the final volume before loading the plate was 1,050 µL. The total reaction time was 4.25 min. The amount of protein used in the reaction was 4.270 µg. Calculate the specific activity of the sample (in nmol min-1 µg-1).You have 10 mg/ml ethidium bromide solution. If you add 5 µl of this to 50 ml of agarose gel solution, what will be the final concentration of ethidium bromide in the gel solution in mg/ml?
- at 257 nm) is dissolved in 2.5 mL of buffer. A 250 microliter aliquot is removed and placed in a 1.0 cm A sample of adenosine triphosphate (ATP) (MW 507, ɛ = 14,700 M'cm cuvette with sufficient buffer to give a total volume of 2.0 mL. The absorbance of the sample at 257 nm is 2.0. Calculate the weight of ATP in the original 2.5 mL sample. (Choose the correct value from the drop-down list provided. The values of weight are listed in units of milligrams.) Weight of ATP: v mgGiven the following information, calculate the total activity in the undiluted protein sample. Activity of 1 ml of diluted sample = 0.5 Total volume of sample = 5 ml Dilution factor = 10 25 50.5 250 2.5A researcher is preparing a reaction mixture to test the activity of a protein. They combine the required reaction components, which contained in a final 100 ml reaction volume 200 mM NaCl, unknown concentrations of acetic acid and acetate anions and a total [H+] concentration of 790 ricromolar. Can you determine the pH of the solution? Provide the answer to one decimal place. Note: You may need to round the numbers to get the required answer. 100 Strips pH indicator strips non-bleeding pH pH 0-14 EM-Reagents Dip in-read while still moist. immerse in weakly-buffered solutions une there is no further color change (1-10 min) 3 7 5 6