CoreModels - Maryland Virtual High School - Montgomery Blair High ...

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Part F. Interpreting the graphsSimulating an enzyme catalytic reaction with a computer model allows you tochange one variable while holding the others constant.Look at the sets of graphs you have sketched for all the changes of the fourvariables. Questions 16 through 20 ask you to interpret the graphs.16. How can you tell from the graphs what the optimum conditions are foreach variable in this simulation?At optimum conditions, the hydrogen peroxide amountdecreases rapidly to almost zero. Water and oxygenmolecules are produced most rapidly. Enzyme catalysisrate is at its highest value.17. What are the most favorable conditions for catalase to break downhydrogen peroxide?Catalase works best between 22 and 35 °C, with pH 6.5 to7.5 (around neutral), and just enough catalase moleculesto break down the supply of hydrogen peroxidemolecules.18. How do the curves for hydrogen peroxide and water compare?The curves are mirror images. For every molecule ofhydrogen peroxide that disappears, a molecule of waterappears.19. How do the graphs for water and oxygen compare?The curves are the same shape, but oxygen’s are half theheight of water’s. Half as many oxygen molecules form inthe reaction as water molecules.20. How do you think the catalase reaction simulated by the STELLA® modelcompares with the reaction in living organisms?In the model, for most of the variables’ values, nearly allthe hydrogen peroxide molecules are used up, so thereaction stops. In living organisms, the cells are alwaysmaking hydrogen peroxide, so the reaction keeps going.T7
Graphs of Values for Parts B, C, D and EEffects of Temperature, pH, Available Enzyme and SubstrateConcentrationPart B. Effect of temperature on enzyme reactions ratesHydrogen PeroxideOxygenWaterH2O2 to WaterPart C. Effect of pH on enzyme reactions ratesHydrogen PeroxideOxygenWaterH2O2 to WaterT8
Page 1 and 2: CoreModelsEnzyme Model—CatalaseA
Page 3 and 4: OVERLOOKEnzyme Model—CatalaseTeac
Page 5 and 6: Extreme environments contain creatu
Page 7 and 8: The sliders represent factors that
Page 9 and 10: Part C. Changing the pHAcidity and
Page 11: 13. What effect do you think changi
Page 15 and 16: Appendix AEnzyme Model—CatalaseTh
Page 17 and 18: Appendix CEnzyme Model—STELLA® E

CoreModels - Maryland Virtual High School - Montgomery Blair High ...

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