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An octapeptide was hydrolyzed and the amino acids separated. It was found to have the following amino acid composition: Gly (1); Ala (2); Val (1); Lys (2); Met (1); Asp (1). After incubation with FDNB and hydrolysis, 2,4-dinitrophenylalanine was detected. Treatment with cyanogen bromide, which cleaves at M, resulted in two fragments: a pentapeptide containing two K residues and a tripeptide containing V, G, and A. (The residues are not listed in any particular order.) After treatment with trypsin, which cleaves at R and K, there were 3 fragments: two dipeptides and MGAV. What is the sequence of the peptide? Use the one-letter abbreviations for the amino acids, and do not use dashes.
How many grams of sodium phosphate Na3PO4(163.9 g/mol) are contained in 205. mL of a sodium phosphate solution that is 0.194 M in sodium ion Na+?
A student is given chloroacetic acid as an unknown weak acid. Calculate the number of milliliters of 0.100 M NaOH required to reach the equivalence point in titration of 0.4840 grams of this acid
Acid, Bases and Proton Transfer, what is the direction of proton transfer?
Stearic acid is made by hydrolyzing fat from cattle. The fat, tallow, is predominately glycerin tristearate (formula C57 H110 O6 molecular weight 891.4g/mol)
Determine how do you find out the new freezing point of a solution if given the formula is Delta T = m x kf x i but how do you find it how does it work?
For the following amino acids, indicate how they might interact to contribute to the tertiary or quaternary structure of a protein. choose from among the following: disulfide bond, salt bridge
For each pair of compounds below, indicate the more reactive in the type of mechanism specified. Briefly state why. Explain the smallest molecular dipole moment
MgNH4PO4 • 6H2O loses H2O stepwise as it is heated. Between 40º and 60º C the monohydrate (MgNH4PO4 • H2O) is formed and above 100º C the anhydrous material (MgNH4PO4) is formed. What are the phosphorus percentages of the monohydrate and anhydrous..
Find the pH of the equivalence point and the volume (mL) of 0.0740 M KOH needed to reach the equivalence point in the titration
Write the expression for the equilibrium constant, Kb, for methylamine also compute the molar concentration of OH- in the 50.0 mL sample of the CH 3 NH 2 solution.
Calculate the molarity of the hydroxide ions in a solution that has been prepared by dissolving 88.7 g of barium hydroxide
Calcium carbide, CaC2, reacts with water to form acetylene. CaC2(s) + 2 H2O(l) -> C2H2(g) + Ca(OH)2(s)
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