FST123 MT2 S99 Smith

FST123 MT2 S99 Smith - N ame FST 123 Midterm Examination...

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Name:__________________ FST 123 Second Midterm Examination Spring, 1997 Values of some useful constants: the Boltzmann constant, k B = 1.38 x 10 -16 erg/degree•molecule the gas law constant, R = 1.98 cal/mole•degree Planck's constant, h = 6.627 x 10 -27 erg•s 1. The reaction B --> C is catalyzed by the enzyme B isomerase. When run with 1 μ g enzyme at 20 ° C the reaction has a Vmax of 180 μ moles/mL•min; at 30 ° C, Vmax is 220 μ moles/mL•min. a. What is the Arrhenius activation energy for the reaction catalyzed by this enzyme? (4 points) b. What is the enthalpy of activation for the reaction? (6 points) c. What is the free energy of activation for the reaction? (6 points) d. What is the value of Q 10 for the reaction? (6 points)
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2 of 5 2. The pH dependence of a bacterial serine protease was determined by measuring the release of NH 3 from an artificial substrate, N-acetyl- tyrosine amide. The initial velocity of the hydrolysis reaction was studied as a function of pH at [S] >> K M and at [S] << K M . The following data were obtained. pH 6.5 9.2 a. Interpret the data in terms of ionizations that affect either the binding or
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FST123 MT2 S99 Smith - N ame FST 123 Midterm Examination...

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