Multiple Choice
In which phase of the cell cycle do cells replicate their chromosomes?
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11. Cell Division
Introduction to the Cell Cycle
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Which stage of the cell cycle involves cell growth and DNA replication?
A
M phase
B
G2 phase
C
S phase
D
G1 phase
Verified step by step guidance1
Understand the cell cycle: The cell cycle is a series of phases that a cell goes through to grow and divide. It consists of interphase (G1, S, and G2 phases) and the M phase (mitosis).
Identify the purpose of each phase: The G1 phase is where the cell grows and carries out normal functions. The S phase is where DNA replication occurs. The G2 phase is where the cell prepares for mitosis. The M phase is where mitosis and cytokinesis occur.
Focus on the S phase: During the S phase, the cell synthesizes a complete copy of the DNA in its nucleus. This is crucial for ensuring that each daughter cell receives an identical set of chromosomes.
Recognize the role of cell growth: While the S phase is primarily known for DNA replication, cell growth also occurs during interphase, including the G1 and G2 phases.
Conclude that the S phase is the stage where both cell growth and DNA replication are key activities, making it the correct answer for the problem.
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