Multiple Choice
During which stage of the cell cycle are chromosomes duplicated (DNA replication 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 in the cell?
A
The cell undergoes cytokinesis, physically dividing into two daughter cells.
B
Chromosomes align at the metaphase plate and attach to spindle microtubules.
C
The cell replicates its DNA, producing sister chromatids for each chromosome.
D
The nuclear envelope breaks down and condensed chromosomes become visible.
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 events that characterize each phase of the eukaryotic cell cycle: G1 (growth), S (DNA synthesis), G2 (preparation for mitosis), and M (mitosis).
Understand that during the S phase, the cell's primary activity is to replicate its DNA, ensuring that each chromosome consists of two identical sister chromatids.
Recognize that other events such as cytokinesis, chromosome alignment at the metaphase plate, and nuclear envelope breakdown occur in different phases (cytokinesis in the end of M phase, metaphase alignment during mitosis, and nuclear envelope breakdown in prophase).
Conclude that the defining event of the S phase is DNA replication, which prepares the cell for subsequent mitosis by doubling the genetic material.
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