BIO NMDCAT Factors that Affect the Rate of Enzyme Reactions

nmdcat.online July 11, 2026

In living organisms, an increase in temperature from 20°C to the optimum value generally results in

A. A gradual decrease in enzyme activity

B. An increase in enzyme activity due to greater kinetic energy

✓

C. No change in enzyme activity

D. Permanent denaturation of the enzyme

📝 Explanation

As temperature rises toward the optimum, enzyme and substrate molecules move faster, increasing successful collisions and enzyme-substrate complex formation. Denaturation usually occurs only above the optimum temperature.

📖 Additional Information

A gradual decrease in enzyme activity
An increase in enzyme activity due to greater kinetic energy
No change in enzyme activity
Permanent denaturation of the enzyme

As temperature rises toward the optimum, enzyme and substrate molecules move faster, increasing successful collisions and enzyme-substrate complex formation. Denaturation usually occurs only above the optimum temperature.

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