BRAINCAKEDifferent Enzymes
As with many chemical reactions, the rate of an enzyme-catalysed reaction increases as the temperature increases.
This is because the molecules have more kinetic energy and move faster so there are more frequent and more successful collisions and more E-S complexes are formed per unit time.
However, at high temperatures the rate decreases again because the enzyme becomes denatured and can no longer function.
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Key terms in this lesson
- enzyme-substrate complex
- The temporary structure formed when a substrate binds to the active site of an enzyme.
- denaturation
- A permanent change to the tertiary or quaternary structure of a protein, caused by heat or pH extremes, that alters the shape of the active site so it is no longer complementary to its substrate.