Multiple Choice
Which phase is the first phase of the cell cycle?
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11. Cell Division
Introduction to the Cell Cycle
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Chromosomes are copied during which phase of the cell cycle?
A
M phase
B
G1 phase
C
S phase
D
G2 phase
Verified step by step guidance1
Understand the cell cycle: The cell cycle consists of several phases that a cell goes through to divide and produce new cells. These phases include G1, S, G2, and M.
Identify the role of each phase: G1 phase is the first gap phase where the cell grows and prepares for DNA replication. S phase is the synthesis phase where DNA replication occurs. G2 phase is the second gap phase where the cell prepares for mitosis. M phase is the mitosis phase where cell division occurs.
Focus on DNA replication: Chromosomes are copied during the S phase of the cell cycle. This is when the DNA is synthesized, resulting in two identical copies of each chromosome.
Differentiate between phases: Recognize that the S phase is distinct from the G1 and G2 phases, which are primarily involved in cell growth and preparation, and the M phase, which involves the actual division of the cell.
Conclude with the correct phase: Based on the understanding of the cell cycle, the correct phase during which chromosomes are copied is the S phase.
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