Multiple Choice
Which of the following best describes the role of the active site in an enzyme's function?
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7. Energy and Metabolism
Enzymes
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Which of the following is changed by the presence of an enzyme in a reaction? and
A
The magnitude of ΔG
B
The G value for the reactants
C
The sign of ΔG
D
The G value for the products
E
The activation energy
Verified step by step guidance1
Understand that enzymes are biological catalysts that speed up reactions by lowering the activation energy required for the reaction to proceed.
Recognize that the activation energy is the energy barrier that must be overcome for reactants to be converted into products.
Note that enzymes do not change the overall free energy change (ΔG) of the reaction, which is the difference in free energy between reactants and products.
Realize that the presence of an enzyme does not alter the G value for the reactants or the products, nor does it change the sign of ΔG.
Conclude that the primary effect of an enzyme is to lower the activation energy, making it easier for the reaction to occur, without affecting the thermodynamic properties of the reactants and products.
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