Multiple Choice
Which of the following shows the correct sequence of the cell cycle?
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11. Cell Division
Introduction to the Cell Cycle
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During which phase of the cell cycle do sister chromatids first appear?
A
S phase
B
G2 phase
C
G1 phase
D
M 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 are 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: Sister chromatids are identical copies of a chromosome that are connected by a centromere. They are formed during the DNA replication process.
Determine when DNA replication occurs: DNA replication, and thus the formation of sister chromatids, occurs during the S phase of the cell cycle.
Conclude that sister chromatids first appear during the S phase, as this is when the DNA is duplicated, resulting in the formation of sister chromatids.
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