Multiple Choice
During which phase of the cell cycle does DNA replication occur?
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16. Cell Division
DNA Replication
Multiple Choice
During the S phase of the eukaryotic cell cycle, what is the primary cellular event that occurs?
A
Cell growth and duplication of many organelles without DNA synthesis
B
Replication of DNA to produce sister chromatids for each chromosome
C
Condensation of chromosomes and breakdown of the nuclear envelope
D
Separation of sister chromatids and their movement to opposite poles
Verified step by step guidance1
Identify the phase of the cell cycle in question, which is the S phase (Synthesis phase) in eukaryotic cells.
Recall that the primary purpose of the S phase is to prepare the cell for division by duplicating its genetic material.
Understand that during the S phase, DNA replication occurs, resulting in each chromosome being copied to form two sister chromatids.
Recognize that other events like cell growth and organelle duplication happen mainly in the G1 phase, not the S phase.
Note that chromosome condensation and nuclear envelope breakdown occur later, during prophase of mitosis, and separation of sister chromatids happens during anaphase.
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