Multiple Choice
During the S phase of the eukaryotic cell cycle, what is the primary event that occurs in the cell?
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16. Cell Division
DNA Replication
Multiple Choice
During the S phase of the eukaryotic cell cycle, which of the following events primarily occurs?
A
DNA is replicated, producing sister chromatids for each chromosome
B
The nuclear envelope breaks down and the mitotic spindle attaches to kinetochores
C
Chromosomes condense and align at the metaphase plate
D
The cell divides its cytoplasm to form two daughter cells (cytokinesis)
Verified step by step guidance1
Identify the phase of the cell cycle mentioned in the problem, which is the S phase (Synthesis phase) of the eukaryotic cell cycle.
Recall the main event that characterizes the S phase: DNA replication. During this phase, the cell duplicates its entire genome to ensure that each daughter cell will receive an identical set of chromosomes.
Understand that DNA replication results in the formation of sister chromatids, which are identical copies of each chromosome connected at the centromere.
Recognize that other events listed, such as nuclear envelope breakdown, spindle attachment, chromosome condensation, alignment at the metaphase plate, and cytokinesis, occur in different phases of the cell cycle (e.g., mitosis or cytokinesis), not during the S phase.
Conclude that the primary event during the S phase is DNA replication producing sister chromatids for each chromosome.
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