객관식
During which phase of mitosis does the cell re-form nuclear membranes around separated chromosomes?
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11. Cell Division
Phases of Mitosis
객관식
Which of the following activities occurs between the two gap phases (G1 and G2) of the cell cycle?
A
DNA replication (S phase)
B
Cytokinesis
C
Spindle fiber formation
D
Chromosome condensation
검증된 단계별 안내1
Understand the cell cycle: The cell cycle consists of several phases, including G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). The G1 and G2 phases are gap phases where the cell grows and prepares for division, while the S phase is where DNA replication occurs.
Identify the activity that occurs between G1 and G2: The S phase is the phase that occurs between G1 and G2. During this phase, the cell replicates its DNA to ensure that each daughter cell will have a complete set of genetic material after division.
Clarify the other options: Cytokinesis occurs after mitosis during the M phase, not between G1 and G2. Spindle fiber formation and chromosome condensation are part of the M phase, specifically during mitosis, not during the S phase.
Focus on DNA replication: DNA replication is the key activity of the S phase. During this process, the cell duplicates its DNA using enzymes like DNA polymerase, ensuring that each chromosome is copied accurately.
Conclude the correct answer: Based on the cell cycle phases, the activity that occurs between G1 and G2 is DNA replication during the S phase.
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