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 of the following organelles is the site of the Krebs cycle?

Mitochondrion

Nucleus

Chloroplast

Ribosome

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Verified step by step guidance

Begin by understanding the Krebs cycle, also known as the citric acid cycle, which is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

Identify the location where the Krebs cycle occurs. The Krebs cycle takes place in the matrix of the mitochondria, which is the innermost compartment of the mitochondrion.

Review the structure and function of the mitochondrion. It is known as the powerhouse of the cell because it generates most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.

Compare the mitochondrion with other organelles listed in the options: the nucleus, chloroplast, and ribosome. The nucleus is involved in storing genetic information, the chloroplast is involved in photosynthesis in plant cells, and the ribosome is the site of protein synthesis.

Conclude that the mitochondrion is the correct organelle where the Krebs cycle occurs, as it is specifically designed for energy production through processes like the Krebs cycle and oxidative phosphorylation.