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B
30- 35 degrees
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C
40- 45 degrees
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D
50 degrees and above
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Solution
The correct option is A 35- 40 degrees Enzymes are biological catalysts which accelerate chemical reactions in organisms. Optimum temperature is the temperature at which enzyme activity is maximum. In humans, this temperature is 37.5oC that is same as the normal body temperature. A rise in temperature above 40oC results in denaturation of the proteins of enzyme. Thus the correct answer is option A.