Multiple Choice
During which stage of the cell cycle are chromosomes (DNA) copied during DNA replication?
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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
The cell grows and synthesizes proteins needed for DNA replication (G1 phase)
B
DNA is replicated, producing sister chromatids for each chromosome
C
The cell divides its cytoplasm to form two daughter cells (cytokinesis)
D
Chromosomes condense and the mitotic spindle begins to form
Verified step by step guidance1
Identify the phases of the eukaryotic cell cycle: G1 phase (cell growth and protein synthesis), S phase (DNA replication), G2 phase (preparation for mitosis), and M phase (mitosis and cytokinesis).
Understand that the S phase is specifically dedicated to the replication of DNA, where each chromosome is duplicated to form sister chromatids.
Recall that during the G1 phase, the cell primarily grows and synthesizes proteins necessary for DNA replication, but actual DNA synthesis does not occur yet.
Recognize that cytokinesis, the division of the cytoplasm to form two daughter cells, occurs after mitosis, not during the S phase.
Note that chromosome condensation and mitotic spindle formation happen during prophase of mitosis, which is after the S phase.
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