Multiple Choice
In enzyme nomenclature, the suffix of an enzyme's name is usually derived from what?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
Which of the following is a characteristic of an enzyme?
A
It increases the reaction rate by increasing the activation energy required for the reaction.
B
It changes the Gibbs free energy change (ΔG) of the overall reaction to make it more favorable.
C
It increases the reaction rate by lowering the activation energy without changing the reaction equilibrium.
D
It is consumed stoichiometrically during the reaction and must be regenerated by external reactions.
Verified step by step guidance1
Understand the role of enzymes in biochemical reactions: enzymes act as biological catalysts that speed up reactions without being consumed in the process.
Recall that enzymes work by lowering the activation energy (Ea) required for a reaction to proceed, which increases the reaction rate.
Recognize that enzymes do not alter the overall Gibbs free energy change (\$\(\Delta\) G\$) of the reaction; the thermodynamic favorability remains the same.
Note that enzymes are not consumed stoichiometrically; they participate in the reaction but are regenerated at the end, allowing them to catalyze multiple reaction cycles.
Conclude that the correct characteristic of an enzyme is that it increases the reaction rate by lowering the activation energy without changing the reaction equilibrium.
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