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For a single-substrate enzyme-catalyzed reaction, calculate the change in substrate concentration required to increase the rate of reaction from 10% to 90% of the limiting rate. What further change would be required to increase the rate to 95% of the limiting rate?
Under certain conditions the maximum specific activity of a purified preparation of triosephosphate isomerase was quoted as 10,000μmoles glyceraldehyde 3-phosphate transformed per mg protein per minute. Express this in terms of katal kg-1 and evaluate the turnover number of the enzyme given that its molecular weight per active site is 26,500 Da.
a mixture of co co2 and o2 is contained within a 275 ml flask at 0c. if the total pressure is 780 torr the co has a
Let's abbreviate the fully protonated form of the diprotic amino acid alanine (NH3+-CHCH3-COOH) as H2L+. Find the pH and concentrations of H2L, HL, and L- in
What mass of isopropyl alcohol (C3H8O) in grams can be melted when a sample absorbs 1575 kJ of heat at its melting point? (Isopropyl alcohol: ?Hfus = 5.37 kJ/mol)
Did all of the powder dissolve. if not how much powder remains undissolved. If so, how much more powder can be dissolved before a saturated solution is reached.
use standard reduction potentials shown below to calculate the potential of a nickel-cadmium cell that uses a basic
Iron metal is formed during the reduction of iron(III) oxide: Fe2O3 + 3CO 2Fe + 3CO2. When 28.4 kg of Fe2O3 react with 17.0 kg of CO and 4.2 kg of Fe are recovered, what is the percent yield for the reaction
a 36 gram sample of copper at 99.8 c is dropped into a beaker containing 207 grams of water at 18.5 c. what is the
The optic nerve needs a minimum of 2.0x10^17 J of energy to trigger a series of impulses that eventually reach the brain.
Draw the structure of the one alkene which upon treatment with O2 followed by Zn and acid, would give rise to formaldehyde and cyclohexanone
Describe how to prepare a total volume of 100 mL of each of the following buffer solutions via titration of 25.00 mL of 0.10M weak acid with strong base, and adding water as needed.
four ice cubes at exactly 0 degrees c having a total mass of 55.0 g are combined with 120 g of water at 76 degrees c in
A scientist wants to make a solution of tribasic sodium phosphate, for a laboratory experiment. How many grams of will be needed to produce 375 of a solution that has a concentration of ions of 1.10
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