Multiple Choice
In which stage of the cell cycle do chromosomes replicate to form identical copies of themselves?
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11. Cell Division
Introduction to the Cell Cycle
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In which phase of the cell cycle does DNA replication occur?
A
G2 phase
B
S phase
C
G1 phase
D
M phase
Verified step by step guidance1
Understand the cell cycle: The cell cycle is divided into several phases, including G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each phase has specific functions in the life of a cell.
Focus on DNA replication: DNA replication is the process by which a cell duplicates its DNA to ensure that each daughter cell receives a complete set of genetic material. This process is critical for cell division.
Identify the phase responsible for DNA replication: DNA replication occurs during the S phase (Synthesis phase) of the cell cycle. This is when the cell synthesizes a complete copy of its DNA.
Clarify the roles of other phases: G1 phase is primarily for cell growth and preparation for DNA replication. G2 phase involves preparation for mitosis, including protein synthesis and organelle duplication. M phase is where mitosis and cytokinesis occur, dividing the cell into two daughter cells.
Conclude that DNA replication does not occur in G1, G2, or M phases, but specifically in the S phase of the cell cycle.
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