Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
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 System3h 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 cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the G₂ phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA at G₁ of the cell cycle in one of the grasshopper daughter cells?

50 units

Between 50 and 100 units

200 units

400 units

100 units

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Verified step by step guidance

Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and mitotic phase (M). During G1, the cell grows and prepares for DNA replication. In S phase, DNA replication occurs, doubling the DNA content. G2 is the final preparation for mitosis.

Recognize the DNA content changes: In G2 phase, the DNA content is doubled compared to G1 because the cell has completed DNA replication during the S phase.

Identify the DNA content in G2: The problem states that cells in G2 contain 200 units of DNA. This means that the DNA content has been doubled from the original amount present in G1.

Calculate the DNA content in G1: Since the DNA content doubles during the S phase, the amount of DNA in G1 would be half of that in G2. Therefore, divide the G2 DNA content by 2.

Determine the DNA content in one daughter cell: After mitosis, each daughter cell receives an equal amount of DNA. Since the DNA content in G1 is 100 units, each daughter cell will have 100 units of DNA after cell division.