Multiple Choice
During the S phase of the eukaryotic cell cycle, which of the following events primarily occurs?
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16. Cell Division
DNA Replication
Multiple Choice
During the S phase of the eukaryotic cell cycle, what is the primary event that occurs?
A
DNA is replicated, producing sister chromatids for each chromosome.
B
Chromosomes align at the metaphase plate to prepare for segregation.
C
The nuclear envelope breaks down and spindle microtubules attach to kinetochores.
D
Cytokinesis divides the cytoplasm to form two daughter cells.
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 events that characterize each phase of the cell cycle: G1 (growth), S (DNA synthesis), G2 (preparation for mitosis), and M (mitosis).
Understand that during the S phase, the cell's DNA is duplicated to ensure that each daughter cell will receive an identical set of chromosomes.
Recognize that this DNA replication results in the formation of sister chromatids, which are identical copies of each chromosome connected at the centromere.
Note that other events like chromosome alignment at the metaphase plate, nuclear envelope breakdown, and cytokinesis occur in later phases (M phase and cytokinesis), not during the S phase.
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