Homework Assignment 1

Homework Assignment 1 - Dr Leisha Mullins BIOCHEMISTRY...

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Dr. Leisha Mullins BIOCHEMISTRY 411/602 Spring 08 Homework Assignment 1 Print Name: ________________ Sign Name: ______________ BIOCHEMISTRY 411/602 Homework Assignment 1 10 points Due: Tuesday, Jan. 22, 2008 PLEASE MAKE A COPY FOR YOURSELF NEATNESS COUNTS. IF I CAN NOT READ YOUR HANDWRITTING, I WILL NOT GRADE IT MAKE SURE YOU STAPLE ALL PAGES!! USE THIS SHEET AS A COVER SHEET. I.E. DO NOT WRITE YOUF ANSWERS HERE!!!! 1. (1pt) The following reaction is catalyzed by galactokinase Galactose + P i Galactose-1-phosphate If G 0 ’= 15.6kJ mol -1 at 25 0 C A. (0.5pts) calculate K eq K eq = e - G/RT = e -(15600J/mol)/8.3145J/.mol K)(298K) = e - 6.29 = 0.001 B. (0.5pts) will the reaction at equilibrium favor the formation of products or reactants? Why? The reaction will not proceed in the direction of products because K eq is less than 1, and the free energy is positive. 2. (1pt) Phosphoglucomutase catalyzes an important step in glycolysis 3-phosphoglycerate 2-phosphoglycerate K eq ’ = 0.15 A. (0.5pts) At 25 0 C what is G 0 G 0 ’ = - RT ln K eq = - (298)(8.315 x 10 -3 KJ/mol K) ln 0.15 = -(2.478)(-1.897) = + 4.701kJ/mol B. (0.5pts) If under cellular conditions, the concentration of 2-phosphoglycerate is 1.5mM
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Homework Assignment 1 - Dr Leisha Mullins BIOCHEMISTRY...

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