Multiple Choice
Which of the following is the primary substrate for the enzyme amylase?
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6. Enzymes and Enzyme Kinetics
Enzymes
Multiple Choice
After an enzyme-catalyzed reaction is completed, what typically happens to the enzyme?
A
It is permanently consumed and must be replaced by a newly synthesized enzyme.
B
It becomes irreversibly converted into product as part of the reaction stoichiometry.
C
It is cleaved into smaller peptide fragments during product release.
D
It is released unchanged and can catalyze another reaction cycle.
Verified step by step guidance1
Understand the role of enzymes in biochemical reactions: enzymes act as catalysts, meaning they speed up reactions without being consumed or permanently altered in the process.
Recall that enzymes lower the activation energy of a reaction, allowing substrates to be converted into products more efficiently, but the enzyme itself remains chemically unchanged.
Recognize that after the reaction, the enzyme releases the product and is free to bind to new substrate molecules, enabling multiple catalytic cycles.
Note that enzymes are not used up or irreversibly modified during the reaction, so they do not need to be replaced after each reaction cycle.
Conclude that the enzyme is released unchanged and can catalyze another reaction cycle, which is why enzymes are effective biological catalysts.
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