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The mysterious peptide X is a nonapeptide that cannot be sequenced by Edman degradation. However, it is susceptible to cleavage by proteases, and the resulting peptide fragments can be sequenced. Treatment of peptide X with trypsin yields the tripeptide phe-ala-arg while treatment with chymotrypsin yields the tripeptide ala-arg-phe. Propose a strcture for peptide X and explain why it cannot be sequenced by Edman degradation.
Suppose that 1.331 g of impure barium hydroxide is dissolved in enough water to produce 250. mL of solution and that 35.0 mL of this solution is titrated to the stoichiometric point with 17.6 mL of 0.0935 M HCl(aq). What percentage of the impure s..
When 0.100g of graphite is burned completely in a bomb calorimeter(heat capacity =3.344kJ/?C), containing 3000 g of water, a temperature rise of 0.21?C is observed.
If 115 of fluorine-18 is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m. ?
If it takes 34.0 mL of 0.0250 M K2Cr2O7 to titrate 10.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+.
Use the appropriate standard reduction potentials to calculate the value
Draw the most stable conformation of trans-1-isobutyl-4-methylcyclohexane in both the chair conformation and the wedge structure.
Acetone, the solvent in some nail polish removers, has a density of 0.791 g/mL. What is the volume of 20.4 g of acetone?
A scuba diver with a lung capacity of 5.2 L inhales a lungful of air at a depth of 45 m and a pressure of 5.5 atm. If the diver were to ascend to the surface (where the pressure is 1.0 atm) while holding her breath.
Why is this isolation so difficult? Please explain using the isoelectric point and the effect PH will have on the structure of your product
what happend of the particles of the substance in the cup (i) when it is a liquid; (ii) as it begins to evaporate; (iii) when the last bit of liquid has just evaporated.
Calculate the mass of nitrogen dissolved at room temperature in an 78.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.
How much energy (in kilojoules) is required to convert 285 ml of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 ?
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