Multiple Choice
During the S phase of the eukaryotic cell cycle, what is the primary event that occurs?
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16. Cell Division
DNA Replication
Multiple Choice
During the eukaryotic cell cycle, chromosomes are duplicated during which phase: interphase or mitosis?
A
G1 phase only (before DNA synthesis begins)
B
Cytokinesis (as the cytoplasm divides)
C
Mitosis (specifically during prophase)
D
Interphase (specifically the S phase of interphase)
Verified step by step guidance1
Understand the phases of the eukaryotic cell cycle: G1 phase (cell growth), S phase (DNA synthesis), G2 phase (preparation for mitosis), and M phase (mitosis and cytokinesis).
Recall that chromosome duplication refers to the replication of DNA, which is necessary before a cell divides to ensure each daughter cell receives a complete set of chromosomes.
Identify that DNA synthesis occurs during the S phase, which is part of interphase, not during mitosis or cytokinesis.
Recognize that mitosis is the phase where the duplicated chromosomes are separated into two daughter nuclei, but the actual duplication happens earlier.
Conclude that chromosomes are duplicated during interphase, specifically in the S phase, making this the correct answer.
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