Your cells need many chemical reactions to happen at the right rates in the right places. Many of the chemical reactions would not normally happen at a sensible rate at body temperature.
That's why our bodies use enzymes. They are made of protein and as as catalysts to help the reactions.
Each enzyme is specific to a particular reaction, so your body has many thousands of them.
Each chemical process needs a whole set of enzymes. For example, they enzymes found in chloroplasts would be associated with photosynthesis.
We use enzymes in biological washing powders and liquids. They allow reactions to occur at low temperatures. This saves energy and prevents fabric from being damaged.
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