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Synthetic polypeptides can assume an ?-helical structure under appropriate conditions. Indicate whether polylysine and polyglutamate form an ?-helix or a disordered structure at the indicated pH values.
POLYLYSINE at pH 13Polylysine at pH 2Polylysine at pH7Polyglutamate at pH 2,7 and 13
a solution of lactic acid, HC3H5O3, on a laboratory shelf was undetermined concentration. If the pH of the solution was found to be 2.51, what was the concentration of the lactic acid?
the anesthetic procaine hydrochloride is often used to deaden pain during dental surgery. the compound is packaged as a 10.% solution (by mass; d= 1.0 g/mL) in water. IF your dentist injects 0.50 mL of the solution, what mass of procaine hydrochlo..
Volume of added base required to reach the equivalence point? State the pH at one half of the equivalence point
reacting ammonia with carbon dioxide. the by product is water. 637.2g of ammonia are reacted with 787.3g of carbon dioxide. which of the two reactant is a limiting reactant?
Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm) per gram of carbon. If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C decay rate should be expected from the wood used ..
A 75.0-mL volume of 0.200 NH3 is titrated with 0.500 M HNO3 . Calculate the pH after the addition of 19.0 mL of HNO3
A cube of a silver-colored metal with a volume of 64 cm3 has a mass of 672 g. The density of pure silver is 10.5 g/cm3. Is the metal pure silver?
Milk will sour in about eight hours at 21*C (70*F = room temperature). How long will raw milk last in a refrigerator maintained at 5*C? Assume the rate constant to be inversely related to souring time.
Calculate the change in internal energy of the following system: a 100.0- bar of gold is heated from 25 to 50 during which it absorbs 322 of heat. Assume the volume of the gold bar remains constant.
One of the advantages offered by a synthetic detergent is that it won't form "soap scum" with hard water. Show the chemical reaction that a soap (use RCO2-) undergoes with calcium or magnesium ions
Compound A, C9H12, undergoes nitration to give 3 products. The 1H NMR spectrum of A shows a complex three-proton multiplet at 6.92-6.99 ? and a nine-proton singlet at 2.34 ?
How much energy is required to completely vaporize a gallon jug of ice (128g) at 0C in 10 seconds? (in kilojoules)
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