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

Each turn of the citric acid cycle directly produces how many ATP molecules?

4 ATP

1 ATP

3 ATP

2 ATP

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Verified step by step guidance

Understand that the citric acid cycle, also known as the Krebs cycle, is a key metabolic pathway that generates energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

Recognize that the primary purpose of the citric acid cycle is to produce high-energy electron carriers, NADH and FADH2, which are used in the electron transport chain to generate ATP.

Identify that during each turn of the citric acid cycle, one molecule of GTP (or ATP, depending on the cell type) is produced directly through substrate-level phosphorylation.

Note that while the cycle itself directly produces only one ATP (or GTP) per turn, the NADH and FADH2 generated will lead to the production of additional ATP molecules through oxidative phosphorylation.

Conclude that the direct production of ATP in the citric acid cycle is limited to one molecule per cycle turn, with the majority of ATP being produced later in the electron transport chain.