Multiple Choice
During which phase of the cell cycle is a cell's DNA replicated?
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14. DNA Synthesis
Introduction to DNA Replication
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Which of the following statements correctly describes the timing of DNA synthesis?
A
DNA synthesis occurs continuously throughout the cell cycle.
B
DNA synthesis occurs during the S phase of the cell cycle.
C
DNA synthesis occurs during the M phase of the cell cycle.
D
DNA synthesis occurs during the G1 phase of the cell cycle.
Verified step by step guidance1
Understand the cell cycle: The cell cycle consists of several phases, including G1, S, G2, and M phases. Each phase has specific functions and events.
Identify the S phase: The S phase, or synthesis phase, is the part of the cell cycle where DNA replication occurs. This is when the cell duplicates its DNA in preparation for cell division.
Differentiate between phases: The G1 phase is the first gap phase where the cell grows and prepares for DNA synthesis. The G2 phase is the second gap phase where the cell prepares for mitosis. The M phase is the mitotic phase where cell division occurs.
Eliminate incorrect options: DNA synthesis does not occur continuously throughout the cell cycle, nor does it occur during the M or G1 phases. These phases have different roles in the cell cycle.
Conclude with the correct timing: Based on the understanding of the cell cycle, DNA synthesis specifically occurs during the S phase, making it the correct answer.
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