Multiple Choice
During the eukaryotic cell cycle, chromosomes are duplicated during which phase: interphase or mitosis?
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16. Cell Division
DNA Replication
Multiple Choice
During S phase of the eukaryotic cell cycle, what is the primary event that occurs to prepare the cell for division?
A
Sister chromatids separate and move to opposite poles of the cell.
B
The nuclear envelope breaks down and spindle microtubules attach to kinetochores.
C
The cell grows and primarily increases its cytoplasmic volume and organelle content without duplicating DNA.
D
The cell replicates its DNA, producing sister chromatids for each chromosome.
Verified step by step guidance1
Identify the phase of the cell cycle in question, which is the S phase (Synthesis phase) of the eukaryotic cell cycle.
Recall that the primary purpose of the S phase is DNA replication, where the cell duplicates its entire genome to ensure each daughter cell receives a complete set of chromosomes.
Understand that during DNA replication, each chromosome is copied to form two identical sister chromatids held together at the centromere.
Recognize that this duplication prepares the cell for subsequent phases, particularly mitosis, where sister chromatids will eventually separate.
Distinguish the S phase from other phases: cell growth mainly occurs in G1, nuclear envelope breakdown and spindle attachment happen in mitosis, and sister chromatid separation occurs during anaphase.
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