BRAINCAKEEffect of Temperature
Temperature affects enzyme activity in two opposing ways.
Up to the optimum: raising the temperature gives the enzyme and substrate molecules more kinetic energy. They move faster and collide more often, so more enzyme-substrate complexes form per second and the rate increases. For many reactions the rate roughly doubles for every 10 °C rise.
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Key terms in this lesson
- denaturation
- A permanent change to the tertiary or secondary structure of a protein, caused by heat or extreme pH, that destroys its shape and function.
- kinetic energy
- The energy a particle has because of its motion; raising temperature increases the kinetic energy of molecules.
More in Enzymes
- Lock and Key Hypothesis
- Induced Fit Hypothesis
- Measuring Rate of Reaction
- Effect of Substrate Concentration
- Effect of pH
- Effect of Enzyme Concentration
- Reversible and Irreversible Inhibition
- Competitive Inhibition
All 14 lessons in Enzymes · All Edexcel AS-level Biology topics