Multiple Choice
The enzymatic breakdown of which of the following compounds does not begin until it reaches the stomach?
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7. Energy and Metabolism
Enzymes
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Which of the following best explains why enzymes can be used repeatedly in biochemical reactions?
A
Enzymes are not consumed or permanently altered during the reaction.
B
Enzymes are converted into reactants during the reaction.
C
Enzymes are only used once because they are destroyed in the reaction.
D
Enzymes become part of the product after the reaction.
Verified step by step guidance1
Understand the role of enzymes in biochemical reactions: Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy required for the reaction to occur.
Recognize that enzymes are not consumed in the reaction: Unlike reactants, enzymes facilitate the reaction without being permanently altered or used up. This allows them to be reused multiple times.
Eliminate incorrect options: For example, 'Enzymes are converted into reactants during the reaction' is incorrect because enzymes do not become part of the reactants. Similarly, 'Enzymes are only used once because they are destroyed in the reaction' is incorrect because enzymes are not destroyed during the reaction.
Clarify why enzymes are not part of the product: The option 'Enzymes become part of the product after the reaction' is incorrect because enzymes do not chemically bond with the products; they remain separate and unchanged.
Conclude with the correct explanation: The correct answer is 'Enzymes are not consumed or permanently altered during the reaction,' as this highlights the key property of enzymes that allows them to be reused repeatedly in biochemical processes.
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