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 cell cycle, what key event occurs in preparation for cell division?
A
Spindle microtubules attach to kinetochores and align chromosomes at the metaphase plate.
B
The cell divides its cytoplasm to form two daughter cells (cytokinesis).
C
The nuclear envelope breaks down and chromosomes condense for segregation.
D
DNA is replicated, producing sister chromatids for each chromosome.
Verified step by step guidance1
Identify the phase of the cell cycle mentioned in the problem, which is the S phase (Synthesis phase).
Recall the main purpose of the S phase: it is the period during which the cell duplicates its DNA to ensure that each daughter cell will receive an identical set of chromosomes.
Understand that during the S phase, each chromosome is replicated to produce two identical sister chromatids connected at the centromere.
Recognize that this DNA replication is essential for accurate chromosome segregation during later stages of cell division, such as mitosis.
Differentiate the S phase event from other cell cycle events like spindle attachment (metaphase), nuclear envelope breakdown (prophase), and cytokinesis, which occur in other phases.
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