Table of contents

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1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Enzymes

Anatomy & Physiology

3. Energy & Cell Processes

Enzymes

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Multiple Choice

Which of the following is changed by the presence of an enzyme in a reaction? and

The magnitude of ΔG

The G value for the reactants

The sign of ΔG

The G value for the products

The activation energy

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Verified step by step guidance

Understand that enzymes are biological catalysts that speed up chemical reactions without being consumed in the process.

Recognize that enzymes work by lowering the activation energy of a reaction, which is the energy barrier that must be overcome for the reaction to proceed.

Note that the activation energy is the only aspect of the reaction that is altered by the presence of an enzyme. It does not change the overall free energy change (ΔG) of the reaction.

Remember that the free energy change (ΔG) is determined by the difference in energy between the reactants and products and is not affected by the enzyme.

Conclude that while enzymes lower the activation energy, they do not alter the G values of the reactants or products, nor do they change the magnitude or sign of ΔG.