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 Heart2h 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

Interphase

Anatomy & Physiology

3. Energy & Cell Processes

Interphase

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Multiple Choice

A biochemist measured the amount of DNA in cells growing in the laboratory and found that the quantity of DNA in the cells doubled __________.

between prophase and anaphase

during the M phase of the cell cycle

between the G₂ phase and prophase

between anaphase and telophase

between the G₁ and G₂ phases

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Verified step by step guidance

Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and the M phase (mitosis). DNA replication occurs during the S phase, which is part of interphase.

Identify the phases where DNA quantity changes: DNA quantity doubles during the S phase, which occurs between the G1 and G2 phases of interphase.

Recognize the role of each phase: G1 phase is the first gap phase where the cell grows and prepares for DNA replication. S phase is where DNA replication occurs, doubling the DNA content. G2 phase is the second gap phase where the cell prepares for mitosis.

Clarify the incorrect options: DNA does not double during the M phase (mitosis), nor between prophase and anaphase, nor between anaphase and telophase. These phases involve the division of already replicated DNA.

Conclude with the correct timing of DNA doubling: The DNA content doubles between the G1 and G2 phases, specifically during the S phase of the cell cycle.