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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

Enzyme Activation Energy

Anatomy & Physiology

3. Energy & Cell Processes

Enzyme Activation Energy

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Multiple Choice

A plot of reaction rate (velocity) against temperature for an enzyme indicates little activity at 10°C and 45°C, with peak activity at 35°C. The most reasonable explanation for the low velocity at 10°C is that __________.

the hydrogen bonds that define the structure of the enzyme's active site are unstable

the substrate becomes a competitive inhibitor at lower temperature

the enzyme was denatured

the cofactors required by the enzyme system lack the thermal energy required to activate the enzyme

there is too little activation energy available

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Verified step by step guidance

Understand that enzyme activity is influenced by temperature, which affects the kinetic energy of molecules.

Recognize that at low temperatures, such as 10°C, the kinetic energy of molecules is reduced, leading to decreased molecular collisions and interactions.

Recall that enzymes require a certain amount of activation energy to catalyze reactions effectively.

At 10°C, the thermal energy available is insufficient to provide the necessary activation energy for the enzyme to function optimally.

Conclude that the low reaction rate at 10°C is due to insufficient activation energy, rather than issues with enzyme structure or substrate interaction.