Changing the temperature changes the rate of an enzyme-catalysed reaction.
A higher temperature increases the rate at first. But if it gets too hot, some of the bonds holding the enzyme together break. This destroys the enzyme's special shape and so it won't work anymore. This means that the enzyme is denatured.
Enzymes in the human body work best at around 37 degrees celsius.
The pH also affects enzymes. If it's too high or too low, the pH interferes with the bonds holding the enzyme together. This changes the shape and denatures the enzyme.
All enzymes have an optimum pH that they work best at. It's often neutral pH 7, but not always- e.g. pepsin is an enzyme used to break down proteins in the stomach. It works best at pH 2, which means it's well-suited to the acidic conditions in the stomach.
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