Which is the stage of the cell cycle when the nuclear membrane reforms around the two new daughter nuclei?

Question

BlackTom AI · Accepted Answer

Telophase is the stage of mitosis when the nuclear membrane re-forms around the separated sets of chromosomes, so the correct choice is b. Telophase.

1) Relevant knowledge points and concepts
- Mitosis proceeds through prophase, prometaphase, metaphase, anaphase, and telophase; cytokinesis often overlaps mitosis but is technically the separation of the cytoplasm.
- During prophase the nuclear envelope breaks down and chromosomes condense; in prometaphase the nuclear envelope is absent and spindle microtubules attach to kinetochores.
- Anaphase is the phase when sister chromatids separate and move toward opposite poles.
- Telophase is characterized by chromosomes reaching the poles, decondensation of chromosomes, and reformation of the nuclear envelope around each daughter chromosome set. Cytokinesis then physically divides the cell.

2) Step-by-step reasoning
- The question asks which stage features reformation of the nuclear membrane around two new daughter nuclei.
- Nuclear envelope breakdown occurs earlier (prophase/prometaphase). Therefore any choice implying early mitotic events is incorrect.
- Anaphase is specifically about chromatid separation and movement, not nuclear envelope reassembly.
- Telophase is the canonical stage defined by nuclear membrane reassembly around two sets of chromosomes, producing two distinct daughter nuclei.
- Cytokinesis divides the cytoplasm and completes cell division; it does not describe the reformation of the nuclear membrane itself (although it often begins during or after telophase).

3) Intermediate steps / checks
- Eliminate prometaphase: nuclear envelope is disassembled, not reformed.
- Eliminate anaphase: chromatids are separating, nuclear envelopes are still absent.
- Eliminate cytokinesis: describes cytoplasmic division, not nuclear membrane reformation.
- Confirm telophase: chromosomes decondense and new nuclear envelopes form — matches the question.

4) Why the correct answer is correct
Telophase is defined by reassembly of the nuclear envelope around each set of daughter chromosomes, restoring two distinct nuclei prior to or concurrent with cytokinesis.

5) Why other options are incorrect (brief)
- a. Cytokinesis: cytoplasmic division, not nuclear membrane reformation.
- c. Prometaphase: nuclear membrane has already broken down.
- d. Anaphase: sister chromatids are being pulled apart; envelopes are not yet reformed.

Conclusion: The correct answer is b. Telophase, which matches the provided answer.

Which is the stage of the cell cycle when the nuclear membrane reforms around the two new daughter nuclei?单项选择题

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