Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

19. Enzymes

Factors Affecting Enzyme Activity

GOB Chemistry

19. Enzymes

Factors Affecting Enzyme Activity

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Multiple Choice

Sucrase has an optimum pH range of 4.5 – 7.0. Which of the following statements is true?

Addition of HCl to increase the pH to 9.0 would decrease its activity.

Sucrase as an enzyme would catalyze the hydrolysis of fructose.

The activity of sucrase would be greater at 100ºC than at 10ºC.

When [Sucrase] = 0.03 M and [Sucrose] = 0.055 M increasing [Sucrase] to 0.07 M will increase the activity.

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Verified step by step guidance

Understand the role of sucrase: Sucrase is an enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose. It does not catalyze the hydrolysis of fructose itself.

Consider the effect of pH on enzyme activity: Enzymes have an optimum pH range where they function best. For sucrase, this range is 4.5 to 7.0. Increasing the pH to 9.0 would be outside this range, likely decreasing its activity.

Evaluate the effect of temperature on enzyme activity: Enzymes typically have an optimum temperature range. Extreme temperatures, such as 100ºC, can denature enzymes, reducing their activity compared to moderate temperatures like 10ºC.

Analyze the effect of enzyme concentration: Increasing the concentration of sucrase from 0.03 M to 0.07 M would generally increase the rate of reaction, assuming substrate concentration is not limiting.

Identify the correct statement: Based on the analysis, the statement that increasing [Sucrase] from 0.03 M to 0.07 M will increase the activity is true, as higher enzyme concentration typically leads to increased reaction rates.