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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.
Devise tests which allow you to distinguish between the ions in each case.
A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 320. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
what is the boiling point of a solution containing 2.33 grams of C8H10N4O2 , dissolved in 15 grams of benzene?
what is the ph of the 0.20 M NH3/0.20 M NH4Cl buffer after the addition of 10.0 ml of 0.10M HCl to 65.0 ml of the buffer.
Calculate the experimental value for Ksp for KHP and determine whether it is within 10% of the theoretical Ksp value (solubility = 8.0g/L). If not, give one reason why this error might have occurred.
The reaction vessel feels cooler. b.The value of K becomes smaller. c.The equilibrium will shift to the left. d.The reaction vessel feels warmer.
Glucose is pumped into some animal cells by a symporter powered by simultaneous entry of Na+. The entry of Na+ provides a free-energy input of 10.8 kJ/mol under typical cellular conditions (external [Na+] = 143 mM, internal [Na+] =14 mM
Which graduated cylinder would have the greatest volume change if equal masses of Au and Pt are transferred to equal volumes of H2O in separate graduated cylinders? Density of gold = 19.31 g/cm3 , density of platinum =21.43 g/cm3
Strontium carbonate decomposes upon heating to strontium oxide and carbon dioxide. Calculate the number of g of carbon dioxide produced by heating 10.7 g of strontium.
If 60.0g of Cu metal at 85C were added to 60.0g ethanol at 10C in a calorimeter of heat capacity 30.0 J/K what would the final temperature be assuming no heat losses? cp for Cu= 0.380 J/K/g and Cp for ethanol = 60.0 J/K/mol
Buffering capacity You want a solution that will buffer the addition of either 10 micromoles of acid or 10 micromoles of base. Total buffer concentration is equal to the concentration of the acid plus the concentration of salt of the acid
Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of hemoglobin
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