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Multiple Choice
What must occur before a body cell can begin mitotic cell division?
A
The nuclear envelope must dissolve.
B
The cell's DNA must be replicated during the S phase of interphase.
C
The cell must complete cytokinesis.
D
The chromosomes must align at the metaphase plate.
Verified step by step guidance
1
Understand the context of mitotic cell division: Mitosis is the process by which a cell divides to produce two identical daughter cells. Before mitosis begins, the cell must prepare itself during interphase.
Learn about the phases of interphase: Interphase consists of three stages—G1 (growth phase), S (synthesis phase), and G2 (preparation for mitosis). The S phase is particularly important for DNA replication.
Recognize the importance of DNA replication: During the S phase of interphase, the cell's DNA is replicated to ensure that each daughter cell receives an identical set of genetic material. This step is crucial for mitosis to proceed.
Understand why DNA replication must occur first: Without DNA replication, the chromosomes cannot be properly distributed to the daughter cells during mitosis. This ensures genetic consistency across cells.
Clarify the sequence of events: After DNA replication in the S phase, the cell progresses to G2, where it prepares for mitosis. Mitosis itself begins with prophase, during which the nuclear envelope dissolves and chromosomes condense, followed by alignment at the metaphase plate during metaphase.