Effect of Environmental Variables on Enzyme Reaction Rate ...

3-1 LABORATORY 3 new Effect of Environmental Variables on Enzyme Reaction Rate in Living Cells A catalyst is a substance that increases the rate of a chemical Reaction without being consumed or permanently changed in the Reaction . The most common catalysts in biological systems are special proteins called enzymes . The substance that an Enzyme operates on is known as its substrate. The physical and chemical properties of enzymes are affected by the conditions under which they must operate (and ultimately, under which they have evolved). Temperature, pH, relative concentrations of Enzyme and substrate and other factors will affect the rate at which an Enzyme catalyzes its particular Reaction . This week, the star of the show is the Enzyme catalase. In aerobic bacteria, protists, fungi, plants, and animals alike, its function is to catalyze the breakdown of hydrogen peroxide (a toxic byproduct of many metabolic reactions ) into harmless water and oxygen via the following Reaction : catalase 2H202 ------------------------------------> 2H20 + 02 To determine how quickly this Reaction proceeds under various conditions, one could measure the amount of H202 decomposed, or the amount of H20

3-1 LABORATORY 3 new Effect of Environmental Variables on Enzyme Reaction Rate in Living Cells A catalyst is a substance that increases the rate of a chemical reaction without being consumed or permanently changed in the reaction.

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