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Enzymes Extra A catalyst is an enzyme that increases the rate of a reaction by changing the way a reaction takes place. It usually stays the same and does not change at the end of a reaction. You would call this an uncatalyzed reaction in a cell and may take place eventually, but not at a rate fast enough for survival. Let's say for example the hydrolysis of proteins in our diet would occur at a point and time without a catalyst, but not fast enough to meet the body's requirement for amino acids. The chemical reaction must occur at an extremely fast rate under mild conditions of ph 7.4 and a body temperature of 37°C it is very important for the body to remain this warm. The heat from our bodies assists with the speed of whatever necessary molecules that are being used in our bodies. A biological catalyst is...

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