Mitosis and the cell cycle Quiz
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5 questions, one answer each
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1. In which phase is DNA replicated?
- A. S phase
- B. Prophase
- C. Anaphase
- D. Cytokinesis
2. In a sample, 60 cells were counted and 9 were in mitosis. What is the mitotic index?
- A. 0.18
- B. 6.7
- C. 0.15
- D. 0.85
3. Why are more cells seen in mitosis at the very tip of a root than 2 cm behind the tip?
- A. The tip contains more chromosomes
- B. The tip contains the meristem, where cells are dividing
- C. Cells behind the tip have no DNA
- D. Cells at the tip have no nuclear envelope
4. Which event happens in anaphase?
- A. Chromosomes condense
- B. Chromosomes line up at the equator
- C. Nuclear envelopes reform
- D. Sister chromatids are pulled to opposite poles
5. A student says that 'a root treated with a drug has a mitotic index of 0.03 compared with 0.12 in a control, so growth will probably be reduced'. Which is the best justification?
- A. Fewer cells are dividing, so fewer new cells are produced
- B. More cells are in interphase, so they must be larger
- C. The drug stops DNA being present in cells
- D. A lower index means chromosomes are not needed