Enzyme activity increases with temperature due to heightened kinetic energy and collision frequency, but excessive heat denatures the enzyme by disrupting bonds and altering the active site, thereby decreasing activity.
Increasing temperature initially increases enzyme activity by boosting molecule kinetic energy and collision frequency. Beyond an optimal temperature, however, high temperatures denature enzymes by breaking bonds, altering the active site and reducing activity.
| Front | How does temperature affect enzyme activity? |
|---|---|
| Back | An increase in temperature increases the kinetic energy of molecules so molecules move round more quickly and are more likely to collide with each other. Increasing temperature in an enzyme controlled reaction increases rate because the collisions between enzyme and substrate increase hence more enzyme substrate complexes are more likely to form. An increase in temperature also after a certain point causes hydrogen and ionic bonds in enzyme structure to break which changes the shape of the active site and the enzyme becomes denatured and so enzyme-substrate complexes are no longer able to form. |
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Ph enzyme change active site substrate affect activity
Previous card: Substrate concentration enzyme increasing molecules number affect activity
Up to card list: AQA Biology Flashcards