The turnover number of an enzyme measures
Correct answer: A. how many substrate molecules one enzyme molecule converts per unit time
- A. how many substrate molecules one enzyme molecule converts per unit time
- B. the number of enzymes in a cell
- C. the temperature at which it denatures
- D. its molar mass
Explanation
Carbonic anhydrase converts around 600,000 molecules of carbon dioxide per second, which is why the reaction in red blood cells is essentially instantaneous. A high turnover number means a small quantity of enzyme suffices. It is a measure of catalytic efficiency rather than of abundance.
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About Enzymes as Biocatalysts
Enzymes are protein or RNA biocatalysts that lower activation energy without being consumed, and their active sites bind specific substrates. The topic covers the lock and key and induced fit models, effects of temperature, pH and substrate concentration, cofactors, enzyme specificity, and competitive versus non-competitive inhibition.
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