Concept:Enzymes evolve to function optimally at the internal body temperature of the organism they belong to.
Solution:- Mammals are endothermic (warm-blooded) and generally maintain a core body temperature around \( 37^{\circ}\text{C} \).
- Enzymes in mammalian bodies have an optimum temperature range closely matching this, typically between \( 37^{\circ}\text{C} \) and \( 40^{\circ}\text{C} \).
- Since \( 37^{\circ}\text{C} \) is not an option, \( 40^{\circ}\text{C} \) represents the closest upper limit of optimal physiological activity before significant denaturation begins.
Why other options are incorrect:\( 20^{\circ}\text{C} \) and \( 30^{\circ}\text{C} \) are too cold for peak mammalian enzyme kinetics. \( 50^{\circ}\text{C} \) is too hot and would cause rapid thermal denaturation of mammalian proteins.
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