Table of contents

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

Krebs Cycle

Anatomy & Physiology

3. Energy & Cell Processes

Krebs Cycle

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Multiple Choice

Which step of the Krebs Cycle does not produce any usable energy in the form of ATP, NADH, or FADH2?

Conversion of isocitrate to α-ketoglutarate

Conversion of citrate to isocitrate

Conversion of malate to oxaloacetate

Conversion of succinyl-CoA to succinate

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Verified step by step guidance

Understand the Krebs Cycle: The Krebs Cycle, also known as the Citric Acid Cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats, and proteins into carbon dioxide and water.

Identify the energy-producing steps: In the Krebs Cycle, energy is captured in the form of ATP, NADH, and FADH2. These molecules are produced at specific steps in the cycle.

Analyze each step: Review each step mentioned in the problem to determine if it produces ATP, NADH, or FADH2. The conversion of isocitrate to α-ketoglutarate produces NADH. The conversion of succinyl-CoA to succinate produces ATP. The conversion of malate to oxaloacetate produces NADH.

Focus on the conversion of citrate to isocitrate: This step involves the isomerization of citrate to isocitrate, which does not produce ATP, NADH, or FADH2. It is a preparatory step for subsequent reactions that do produce energy.

Conclude which step does not produce usable energy: Based on the analysis, the conversion of citrate to isocitrate is the step in the Krebs Cycle that does not produce any usable energy in the form of ATP, NADH, or FADH2.