Answer:
A
Explanation:
Beacuse as temperature increases the enzymes becomes denatured
The rate of a biochemical reaction decreases at high temperatures as the shape of the enzyme changes.
• In several chemical reactions, the rate of an enzyme-catalyzed reaction enhances with the increase in temperature.
• However, at high temperatures, a decline in the rate of reaction is noticed as the enzyme becomes denatured and fails to function anymore.
• At enzyme's optimum temperature, an optimum activity is attained. However, a spontaneous enhancement in temperature leads to a sharp decline in activity as the active site of the enzyme changes its shape, that is, it becomes denatured.
Thus, the correct answer is option A, that is, the shape of the enzyme changes.
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