Catalase activity can be determined by
A. Measuring the ratio of catalase to oxygen.
B. Observing when the amount of hydrogen peroxide equals the amount of oxygen.
C. Measuring the amount of catalase remaining in the chemical reaction.
D. Measuring the formation of hydrogen peroxide.
E. Measuring the formation of oxygen gas.
The Correct Answer and Explanation is:
The correct answer is E. Measuring the formation of oxygen gas.
Explanation:
Catalase is an enzyme found in many living organisms, including humans, and its primary function is to catalyze the decomposition of hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen (O₂). The reaction is as follows:
[ 2 H_2O_2 \rightarrow 2 H_2O + O_2 ]
The breakdown of hydrogen peroxide by catalase is a rapid and efficient process, and the production of oxygen gas is a key indicator of the enzyme’s activity.
To measure catalase activity, researchers often focus on the formation of oxygen gas. This is because the reaction directly produces O₂, and the amount of O₂ produced can be quantified using various methods. For example, a gas collection apparatus or an oxygen probe can be used to measure the volume of oxygen gas produced over time as the reaction proceeds. The rate at which oxygen is released is directly proportional to the catalytic activity of catalase.
Why the other answers are incorrect:
- A. Measuring the ratio of catalase to oxygen: This is not a standard method for determining catalase activity. While the presence of oxygen is important, measuring a “ratio” of catalase to oxygen is not typically how catalase activity is quantified.
- B. Observing when the amount of hydrogen peroxide equals the amount of oxygen: The reaction does not occur in a 1:1 stoichiometric ratio. For every two molecules of hydrogen peroxide, two molecules of water and one molecule of oxygen are produced, so this method is not suitable.
- C. Measuring the amount of catalase remaining in the chemical reaction: Measuring the remaining catalase is not a common method. Since catalase is a catalyst, it is not consumed in the reaction, and measuring its “remaining” amount is not the primary way to assess activity.
- D. Measuring the formation of hydrogen peroxide: Since catalase is responsible for breaking down hydrogen peroxide, its formation is not the focus when measuring catalase activity. The formation of hydrogen peroxide would suggest the reaction has not occurred or is reversed, which is not the aim of measuring catalase activity.
Thus, measuring the formation of oxygen gas is the most direct and accurate method for determining catalase activity.