Multiple Choice
In a typical proliferating mammalian cell, which phase of the cell cycle is usually the longest?
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16. Cell Division
Overview of the Cell Cycle
Multiple Choice
In the context of the eukaryotic cell cycle, what must occur before mitosis (M phase) can take place?
A
Cytokinesis must occur first to separate the cytoplasm before chromosomes can segregate.
B
DNA replication must be completed during S phase so that each daughter cell can receive a full set of chromosomes.
C
The nuclear envelope must permanently disassemble so the cell can remain in a multinucleated state.
D
Homologous chromosomes must pair and undergo crossing over to generate genetic diversity.
Verified step by step guidance1
Understand the phases of the eukaryotic cell cycle: G1 (gap 1), S (synthesis), G2 (gap 2), and M (mitosis).
Recognize that before mitosis (M phase) begins, the cell must have duplicated its DNA to ensure each daughter cell receives a complete set of chromosomes.
Identify that DNA replication occurs during the S phase, which is the synthesis phase where the entire genome is copied.
Note that cytokinesis, the division of the cytoplasm, occurs after mitosis, not before it.
Understand that the nuclear envelope temporarily breaks down during mitosis to allow chromosome segregation but does not permanently disassemble to maintain a multinucleated state, and that homologous chromosome pairing and crossing over occur during meiosis, not mitosis.
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