Multiple Choice
In enzyme-catalyzed reactions, what is the term for a substance that is changed by an enzyme?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
Which term best describes an enzyme?
A
A biological catalyst that increases reaction rate by lowering activation energy without being consumed
B
A nonbiological inhibitor that irreversibly blocks substrate binding at the active site
C
A reactant that is permanently altered into products during a reaction
D
A molecule that increases reaction rate by raising the activation energy barrier
Verified step by step guidance1
Step 1: Understand the role of enzymes in biochemical reactions. Enzymes are proteins that act as biological catalysts, meaning they speed up reactions without being consumed in the process.
Step 2: Recall that enzymes work by lowering the activation energy required for a reaction to proceed. Activation energy is the energy barrier that must be overcome for reactants to be converted into products.
Step 3: Recognize that enzymes are not reactants themselves; they do not get permanently altered or consumed during the reaction. Instead, they facilitate the reaction and remain unchanged afterward.
Step 4: Differentiate enzymes from inhibitors. Inhibitors can block enzyme activity, sometimes irreversibly, but enzymes themselves are not inhibitors.
Step 5: Conclude that the best description of an enzyme is a biological catalyst that increases reaction rate by lowering activation energy without being consumed.
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