Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

16. Cell Division

Mitosis

Cell Biology

16. Cell Division

Mitosis

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Multiple Choice

During which phase of the cell cycle are chromosomes (DNA) replicated in preparation for mitosis?

Metaphase

Prophase

G1 phase

S phase

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Verified step by step guidance

Understand the cell cycle: The cell cycle consists of several phases, including G1, S, G2, and M (mitosis). Each phase has a specific role in cell growth and division.

Recall the purpose of the S phase: The S phase (synthesis phase) is the part of the cell cycle where DNA replication occurs. During this phase, the cell duplicates its chromosomes to ensure that each daughter cell receives an identical set of genetic material.

Differentiate between the phases: G1 phase is a period of cell growth and preparation for DNA replication, but no DNA synthesis occurs here. Metaphase and prophase are stages of mitosis, which occur after DNA replication is complete.

Identify the correct phase: Since the question asks about the phase where chromosomes (DNA) are replicated, the correct answer is the S phase.

Conclude: The S phase is critical for ensuring that the cell has two complete sets of DNA before entering mitosis, where the chromosomes are separated into daughter cells.