May '11
MCAT Question of the Day | MCAT Course

  • Q:

    A particular enzyme-catalyzed biological reaction (Reaction 1) in humans takes the substrate A and converts it to B. The ΔG is -100 kJ/mol. A different enzyme is later found which also has A as a substrate (Reaction 2). The identity of the product from this different enzyme is not recorded. It is found that the ΔG for this new reaction is -120 kJ/mol. Which of the following holds true?



    Reaction 2 must run faster kinetically than Reaction 1


    The second enzyme is more efficient at converting A to B due to the larger decrease in free energy


    Reactant A can bind to 2 enzymes at a time


    The product of Reaction 2 cannot be B

    Tags: Thermochemistry | Chemical Kinetics | Suggest a tag


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