The essential difference between denaturation and inhibition of an enzyme is that denaturation
Correct answer: C. involves the loss of the enzyme's three dimensional shape and is usually permanent
- A. always occurs at the active site only
- B. can be reversed by adding more substrate
- C. involves the loss of the enzyme's three dimensional shape and is usually permanent
- D. increases the rate of the reaction
Explanation
Denaturation unfolds the whole protein, so the enzyme is destroyed as a catalyst and no amount of substrate will restore it, whereas most inhibition leaves the enzyme intact and is reversible when the inhibitor is removed or, for competitive inhibitors, outcompeted. High temperature and extreme pH denature, while specific molecules inhibit. Only competitive inhibition is relieved by extra substrate.
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About Factors Affecting Enzyme Action
Enzyme activity changes with temperature, pH, substrate concentration and enzyme concentration because these factors affect molecular collisions and the active site. Questions also examine optimum conditions, denaturation and inhibition, while distinguishing a fall in activity caused by unsuitable conditions from permanent enzyme damage.
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