Multiple Choice
Which of the following could not clearly be a contributor to general acid-base catalysis (circle all that apply)?
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6. Enzymes and Enzyme Kinetics
Catalysis
Multiple Choice
In enzyme-catalyzed reactions, can the same enzyme molecule be used more than once, and why?
A
No; the enzyme must be resynthesized after each turnover because it is denatured by catalysis.
B
Yes; the enzyme is not consumed in the overall reaction and is regenerated after releasing product.
C
Yes, but only if a covalent enzyme-substrate intermediate permanently stores the substrate.
D
No; the enzyme is irreversibly converted into product during each catalytic cycle.
Verified step by step guidance1
Understand the role of enzymes in biochemical reactions: enzymes act as catalysts that speed up reactions without being consumed or permanently altered in the process.
Recall that enzymes bind to substrates to form an enzyme-substrate complex, facilitating the conversion of substrates into products.
Recognize that after the product is released, the enzyme returns to its original state, ready to catalyze another reaction cycle.
Note that enzymes are not denatured or irreversibly changed during normal catalysis; they maintain their structure and function across multiple turnovers.
Therefore, the same enzyme molecule can be used repeatedly because it is regenerated after each catalytic cycle and is not consumed in the overall reaction.
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