Multiple Choice
How do enzymes affect the activation energy of a chemical reaction?
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6. Enzymes and Enzyme Kinetics
Activation Energy
Multiple Choice
In the context of activation energy, which part of a chemical reaction is changed by an enzyme?
A
The identity and standard free energies of the reactants and products
B
The equilibrium constant (K) of the reaction
C
The overall Gibbs free energy change (ΔG) between reactants and products
D
The activation energy barrier (the energy required to reach the transition state)
Verified step by step guidance1
Understand that enzymes function as biological catalysts, which means they speed up chemical reactions without being consumed in the process.
Recall that the activation energy (E_a) is the minimum energy required for reactants to reach the transition state and proceed to products.
Recognize that enzymes lower the activation energy barrier, making it easier for the reaction to proceed, but they do not alter the intrinsic properties of reactants or products.
Note that the equilibrium constant (K) and the overall Gibbs free energy change (\$\(\Delta\) G\$) depend on the difference in free energy between reactants and products, which enzymes do not change.
Conclude that the enzyme specifically changes the activation energy barrier, facilitating the formation of the transition state and increasing the reaction rate without affecting the thermodynamics of the reaction.
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