They speed up the time it takes for a reaction to complete by reducing the activation energy required for the reaction to take place. Some examples are Catalytic Converters in vehicles, and bromelain from pineapples (they break down meat and make it more tender).
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The way enzymes speed up chemical/biochemical reactions is the same way that catalysts work. They provide an alternate pathway for the reaction which has a LOWER activation energy. They don't actually decrease the activation energy of the pathway in question, but rather they provide a different pathway that has a lower energy of activation.
Catalysts are chemicals that alter the rate of a chemical reaction without being chemically changed themselves . However to alter the rate of the reaction , the catalysts need to come in contact with the reactant particles. Spreading out the catalyst increases its surface area , hence increases the chances of coming in contact with the reactant particles . So they are able to provide the reactant particles an alternative route with a lower activation energy for the reactant particles to collide and form the product .
No, they simply provide the energy for the reaction to occur. Specific enzymes are the catalysts, as they are the ones to lower the Ea of the reaction and use the energy from ATP --> ADP + Pi. These processes are often exergonic and irreversible.
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Some of the facts are: 1. Catalysts never get consumed in a reaction 2. Catalysts lower the activation energy of the reaction by providing an alternative path to it. 3. Some catalysts do not take part in reaction. They just provide surface or sites for the reaction to take place.