02/19/2018 11:59 PM 067.8/1002/16/2018 09:38 AM Gradebook PrintPeriodic Table Qu

Question

02/19/2018 11:59 PM 067.8/1002/16/2018 09:38 AM Gradebook PrintPeriodic Table Question 9 of 26 Map dab as Sapling Learning An oligomeric protein has a molecular weight of 245000. A 410 mg sample was treated with an ex 1-fluoro-2,4-dinitrobenzene (San were hydrolyzed by heating with concentrated HC. The product of the complete hydrolysis contained 2.6 mg of the compound shown,below, and no other 2,4-dinitrophenyl derivatives of the -amino groups of cess of gers reagent) until the reaction was complete. Next the peptide bonds other amino acids could be found. NO2 How many polypeptide chains are in this protein? (Enter your answer as a whole number). )--NH-C-COOH O2N CH3 Number Previous Give Up & View Solution e Check Answer e Next-I Ext- Hint

Explanation / Answer

mmoles of 2,4 -DNP derivative = mass / molar mass

                                            = 2.6 mg / 256 g / mol

                                           =0.010 mmol

number of moles of protein = 410 / 245000

                                            = 1.67 x 10^-3 mmol

number of polypeptides bonds = 0.010/ 1.67 x 10^-3

                                                 = 6.0

polypeptide chains = 6

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