Multiple Choice
Which of the following is not a way that enzymes increase rates of reactions?
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6. Enzymes and Enzyme Kinetics
Activation Energy
Multiple Choice
In a reaction coordinate diagram showing free energy versus reaction progress, which curve represents the reaction pathway in the presence of an enzyme?
A
The curve that changes the overall free energy change of the reaction so that for a reaction that was previously
B
The curve with the higher activation energy barrier () but the same overall free energy change () as the uncatalyzed reaction
C
The curve with the lower activation energy barrier () while having the same overall free energy change () as the uncatalyzed reaction
D
The curve that has the same activation energy barrier () but a smaller magnitude of than the uncatalyzed reaction
Verified step by step guidance1
Understand that a reaction coordinate diagram plots the free energy (G) of the system against the progress of the reaction, showing the energy changes from reactants to products.
Recall that the overall free energy change of the reaction, denoted as \(\Delta\Delta G\), is the difference in free energy between products and reactants and determines whether a reaction is spontaneous (\(\Delta G < 0\)) or non-spontaneous (\(\Delta G > 0\)).
Recognize that enzymes function by lowering the activation energy barrier (\(E_a\)) of a reaction, which is the energy required to reach the transition state, but they do not change the overall free energy change (\(\Delta G\)) of the reaction.
Therefore, in the reaction coordinate diagram, the curve representing the enzyme-catalyzed reaction will have a lower peak (lower \(E_a\)) compared to the uncatalyzed reaction, but the starting and ending points (reflecting \(\Delta G\)) remain the same.
Conclude that the correct curve is the one with a lower activation energy barrier (\(E_a\)) but the same overall free energy change (\(\Delta G\)) as the uncatalyzed reaction.
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