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

In which phase of the cell cycle is there no checkpoint?

G1 phase

G2 phase

S phase

M phase

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Verified step by step guidance

Understand the cell cycle: The cell cycle consists of four main phases: G1, S, G2, and M. Each phase has specific functions and checkpoints to ensure proper cell division.

Identify the purpose of checkpoints: Checkpoints are control mechanisms in the cell cycle that ensure each phase is completed accurately before moving on to the next phase. They help prevent errors such as DNA damage or incomplete replication.

Review the G1 phase: The G1 phase is the first gap phase where the cell grows and prepares for DNA replication. It has a checkpoint to ensure the cell is ready to enter the S phase.

Examine the G2 phase: The G2 phase is the second gap phase where the cell prepares for mitosis. It has a checkpoint to verify that DNA replication in the S phase was completed successfully and that the cell is ready for mitosis.

Analyze the S phase: The S phase is where DNA replication occurs. Unlike the G1, G2, and M phases, the S phase does not have a specific checkpoint. Instead, it focuses on the accurate replication of the cell's DNA.