Question at position 7 The majority of the lifespan of a cell is spent as this phaseinterphaseanaphaseprophasetelophase单项选择题
A
interphase
B
anaphase
C
prophase
D
telophase

Question

Question at position 7 The majority of the lifespan of a cell is spent as this phaseinterphaseanaphaseprophasetelophase

BlackTom AI · Accepted Answer

Interphase is the longest phase of the cell cycle because it includes growth, DNA replication and preparation for mitosis, occupying the majority of a cell’s life.

1. Relevant knowledge points and concepts
- The cell cycle has two major parts: interphase and M phase (mitosis + cytokinesis).
- Interphase consists of G1 (cell growth), S (DNA synthesis/replication), and G2 (preparation for mitosis).
- Mitosis is subdivided into prophase, metaphase, anaphase, and telophase and is relatively brief compared with interphase.

2. Step-by-step reasoning
- Cells spend time growing and duplicating their DNA before division; these processes occur during interphase.
- Mitosis (prophase → metaphase → anaphase → telophase) is the process of segregating chromosomes and dividing the cell, which is brief relative to the time needed to grow and replicate DNA.
- Therefore, most of the cell’s lifespan must be the preparatory phases (interphase) rather than the relatively short mitotic stages.

3. Calculations / intermediate steps (typical timing example)
- For a typical mammalian cell with a 24-hour cycle: interphase ≈ 20 hours (G1 ≈ 11 h, S ≈ 8 h, G2 ≈ 1 h), M phase ≈ 1 hour (mitosis) + cytokinesis ≈ 1–2 hours. 
- Fraction in interphase ≈ 20/24 ≈ 0.83 (≈83%), far greater than time in any single mitotic stage (each mitotic stage is minutes to an hour).

4. Why the correct answer is correct
- Interphase contains the lengthy processes of growth and DNA replication required before division, so it occupies the bulk of the cycle. The other answer choices are individual mitotic stages and are brief.

5. Why other options are incorrect
- Prophase, anaphase, and telophase are steps within mitosis; each lasts a small fraction of the total cycle time. None represent the majority of the cell’s lifespan.

6. Conclusion
- The correct answer is interphase, which matches the provided answer.

Question at position 7 The majority of the lifespan of a cell is spent as this phaseinterphaseanaphaseprophasetelophase单项选择题

类似问题

In which phase of the cell cycle does DNA replication (making a second copy of DNA) occur?

At what stage of the cell cycle would you expect there to be twice the amount of DNA as normal?

Question at position 91 In eukaryotes the replication of chromosomal DNA occurs during:G2 phaseanaphaseG1 phaseprophaseS phase

If A, B, and C represent G1, S, and G2, respectively, then which phase of the cell cycle would you predict to last the longest in duration? Use the data shown in the left panel (Cells without treatment graph) to answer this question.

Use the figure to answer the question below. In the figure, why does the amount of DNA in nucleus decrease from IV to V?

After S phase of interphase, each chromosome contains two sister chromatids.

Chromosome replication in a somatic cell takes place during

During what portion of the cell cycle does interphase occur?

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