When a cell in S phase is fused with a cell in G1, __________.

DNA synthesis begins immediately in the original G 1 nucleus

When a cell in S phase is fused with a cell in G 1 , __________.

DNA synthesis begins immediately in the original G 1 nucleus

the chromosomes of the original G 1 nucleus condense in preparation for mitosis

the original G 1 cell will divide immediately

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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

Cell Cycle Regulation

Anatomy & Physiology

3. Energy & Cell Processes

Cell Cycle Regulation

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Multiple Choice

When a cell in S phase is fused with a cell in G₁, __________.

the replication of DNA occurring in the original S nucleus is terminated

the two nuclei fuse and additional division is arrested

the chromosomes of the original G₁ nucleus condense in preparation for mitosis

the original G₁ cell will divide immediately

DNA synthesis begins immediately in the original G₁ nucleus

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Verified step by step guidance

Understand the cell cycle phases: G1 is the first gap phase where the cell grows and prepares for DNA replication. S phase is where DNA replication occurs. G2 is the second gap phase, and M phase is mitosis.

Recognize that cell fusion experiments help us understand cell cycle regulation. When two cells at different stages of the cell cycle are fused, the cytoplasmic factors from one cell can influence the other.

Identify that in this scenario, a cell in S phase is fused with a cell in G1 phase. The S phase cell contains factors that promote DNA replication.

Consider the influence of S phase factors on the G1 nucleus. The presence of S phase promoting factors in the cytoplasm can trigger the G1 nucleus to begin DNA synthesis prematurely.

Conclude that when a G1 cell is fused with an S phase cell, the G1 nucleus is induced to enter S phase, leading to the immediate initiation of DNA synthesis in the original G1 nucleus.