Question 9
Catalase is an enzyme found in animal and plant cells, which catalyze breakdown of hydrogen peroxide into oxygen and water. $2H_2O_2\rightarrow O_2+2H_2O$ The activity of catalase can be observed by first soaking many pieces of same small discs of filter paper in a solution containing the enzyme. The discs are then submerged in a diluted solution of hydrogen peroxide. The filter discs are observed to sink at first but float to the surface. Which experiments can be used to measure the rate of the breakdown of the reaction? (write down ✓if correct or ✗ if wrong) (2 points) 9.1 Measure the distance that discs drop down from the surface of the solution. 9.2 Measure the time that discs take to rise to the surface of the solution. 9.3 Measure the weight of the discs before and after soaking in the solution. 9.4 Count the number of discs that have floated to the surface in a fixed time.