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

Cell Cycle Regulation

Anatomy & Physiology

3. Energy & Cell Processes

Cell Cycle Regulation

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Multiple Choice

Tissue culture experiments with PDGF demonstrate that without this substance, __________.

bacterial cells lose their resistance to antibiotics

cells divide in an uncontrolled fashion, confirming PDGF's role as a cell division inhibitor

animal cells are unable to attach to the substratum

the various kinases, such as MPF, are unable to bind to cyclin

fibroblasts fail to divide

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Verified step by step guidance

Understand the role of PDGF (Platelet-Derived Growth Factor) in cell division. PDGF is a growth factor that regulates cell growth and division, particularly in fibroblasts, which are a type of animal cell.

Recognize that fibroblasts are connective tissue cells that play a crucial role in wound healing and tissue repair. They require specific signals to divide and proliferate.

Identify that PDGF acts as a signaling molecule that binds to receptors on the surface of fibroblasts, initiating a cascade of events that lead to cell division.

Consider the absence of PDGF in tissue culture experiments. Without PDGF, the signaling pathway necessary for fibroblast division is not activated, leading to a failure in cell division.

Conclude that the correct answer is that fibroblasts fail to divide without PDGF, highlighting its essential role in the regulation of cell division in these cells.