Which statement about enzymes as biological catalysts is correct?
- A. They are consumed during the reaction
- B. They allow energetically impossible reactions to occur
- C. They increase the energy content of the products
- D. They are regenerated unchanged at the end of the reaction
Explanation
An enzyme leaves the reaction exactly as it entered, which is why tiny amounts can process huge quantities of substrate. It only speeds a reaction that could happen anyway by lowering the activation energy; it never changes the energy of substrates or products.
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