Which statement about enzymes is correct?
Correct answer: B. They remain chemically unchanged at the end of the reaction
- A. They are consumed in the reactions they catalyse
- B. They remain chemically unchanged at the end of the reaction
- C. They can catalyse reactions that would otherwise be thermodynamically impossible
- D. They work equally well at every pH
Explanation
An enzyme releases the product and returns to its original state, ready to bind the next substrate molecule, which is why a small amount catalyses the conversion of a great deal of substrate. Enzymes only speed up reactions that were already energetically favourable; they cannot drive an unfavourable one. Each has a narrow pH optimum outside which activity falls off.
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About Characteristics of Enzymes
Enzymes are globular biological catalysts that lower activation energy without being consumed, usually showing specificity for particular substrates. Questions cover active sites, enzyme substrate complexes, the lock and key and induced fit models, intracellular and extracellular action, and the effects of denaturation, while distinguishing enzymes from non biological catalysts.
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