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JEE Main levelSingle correct optionDifficulty 2 of 3sc076

The rate of an enzyme-catalysed reaction plotted against temperature

Arises exponentially at all temperatures as predicted by the Arrhenius equation
Brises to a maximum and then stays constant at higher temperatures
Cdecreases continuously from 273 K onwards
Drises to a maximum near the optimum temperature and then falls sharply because the enzyme is denatured

Answer: D

At low temperature the rate rises as usual, but above the optimum the protein unfolds (denaturation) and loses its active site, so the rate drops sharply.

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