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

Pepsin, a peptidase that hydrolyzes proteins, functions in the stomach at an optimum pH of 1.5 to 2.0.
Which of the following would cause an increase in its activity?

Changing the pH to 8.0.

Running the reaction at 0ºC.

Increasing the concentration of pepsin two-fold.

Changing the aqueous environment temperature to 60ºC.

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Verified step by step guidance

Understand the role of pepsin: Pepsin is an enzyme that breaks down proteins in the stomach, and it works best at a specific pH range of 1.5 to 2.0.

Consider the effect of pH on enzyme activity: Enzymes have an optimal pH range where they function most effectively. A pH of 8.0 is far outside the optimal range for pepsin, which would likely decrease its activity.

Evaluate the impact of temperature on enzyme activity: Enzymes also have an optimal temperature range. Running the reaction at 0ºC would slow down the enzyme activity significantly, as lower temperatures generally decrease reaction rates.

Analyze the effect of enzyme concentration: Increasing the concentration of pepsin would increase the rate of reaction, assuming substrate availability is not a limiting factor. This is because more enzyme molecules are available to catalyze the reaction.

Assess the effect of high temperature: Changing the temperature to 60ºC could denature the enzyme, as high temperatures can disrupt the enzyme's structure, leading to a loss of activity. Therefore, this would not increase pepsin activity.