D2.1 Cell and nuclear division Quiz
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5 questions, one answer each
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1. In which phase of interphase is DNA replicated?
- A. G1
- B. S
- C. G2
- D. Cytokinesis
2. HL: Of 250 cells counted, 30 are in mitosis. What is the mitotic index?
- A. 0.12
- B. 0.14
- C. 0.30
- D. 0.88
3. HL: What must happen for a cell to pass a cell-cycle checkpoint?
- A. All cyclins must be absent
- B. A specific cyclin must reach a threshold concentration
- C. The nuclear membrane must re-form
- D. The cell must stop making proteins
4. HL: A mutation makes a tumour suppressor gene non-functional. What is the likely effect?
- A. Division is inhibited more strongly
- B. A brake on the cell cycle is lost, so division may become uncontrolled
- C. The gene becomes an oncogene
- D. The cell enters meiosis
5. HL: Which feature shows a tumour is malignant?
- A. It is enclosed in a capsule
- B. It grows slowly
- C. Its cells invade neighbouring tissue
- D. It stays the same size