Answer :
When an enzyme catalyzes a reaction it decreases the activation energy of the reaction.
Enzymes are biocatalysts. A catalyst lowers the activation energy of a reaction. The lower the activation energy of a reaction, the faster it will go. Therefore, enzymes speed up reactions by lowering their activation energy. Enzymes bind substrates at key points in their structures called active sites. They are usually very specific, binding only specific substrates for specific reactions.
Without enzymes, most metabolic reactions would take much longer and not be fast enough to sustain life. Enzymes are proteins and biochemical reactions occur by lowering the activation energy of a reaction It increases the possibilities and makes those reactions thousands or millions of times faster than without the catalyst. Enzymes are highly specific for their substrates.
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