What is the temperature optimum for a human enzyme?

What is the temperature optimum for a human enzyme?

• A. It is greater than 37°C because it may be adapted to function efficiently at body temperature.
• B. It is exactly 37°C.
• C. It is 25°C.
• D. It is below 0°C.

Answer: (A)

Enzyme activity is highest at the temperature where the enzyme’s shape and active site work best. For human enzymes, that environment is the human body's normal temperature, about 37°C. If an enzyme had its optimum at a temperature higher than 37°C, it would not be operating at its peak activity inside the body; it would be most active only at hotter conditions that the body doesn’t reach. Temperatures that are cooler, like 25°C, slow molecular motion and reduce activity, while temperatures near or below freezing can further impair structure and function. So, the best fit is that human enzymes are optimized around 37°C.

Enzyme activity is highest at the temperature where the enzyme’s shape and active site work best. For human enzymes, that environment is the human body's normal temperature, about 37°C. If an enzyme had its optimum at a temperature higher than 37°C, it would not be operating at its peak activity inside the body; it would be most active only at hotter conditions that the body doesn’t reach. Temperatures that are cooler, like 25°C, slow molecular motion and reduce activity, while temperatures near or below freezing can further impair structure and function. So, the best fit is that human enzymes are optimized around 37°C.