plumiThe cell cycle and its regulation: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 2.1.6.1 The cell cycle and its regulation, 2016–2025, with mark schemes and examiner’s reports where available.
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Q21(c)
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All 19 questions on The cell cycle and its regulation, as a list
- June 2024, Paper 2, Q21(c) (2 marks): The cell cycle of an onion cell is estimated to be 15 h. A root-tip squash from an onion contained 124 cells. 16 of the cells were undergoing mitosis. Calculate
- June 2024, Paper 2, Q21(d) (6 marks): The cell cycle describes a series of events that occur during the life of a cell. Complete the sentences by choosing the most appropriate terms. During mitosis
- June 2024, AS Paper 1, Q23(c) (2 marks): An outline of the eukaryotic cell cycle is shown below. X, Y and Z represent checkpoints in the regulation of the cell cycle. C M Z Y G2 G1 X S G0 A cell that h
- June 2023, Paper 2, Q3 (1 mark): Which option correctly describes the sequence of events during the cell cycle? A Cytokinesis interphase G1 G2 S mitosis B Cytokinesis mitosis interphase C G2 mi
- June 2023, Paper 3, Q2(b) (2 marks): Vitamin B9 is needed for the synthesis of molecule D, shown in Fig. 2.2. Fig. 2.2 O CH3 HN O HO N O OH Molecule D Molecule D is a component in the structure of
- June 2022, AS Paper 2, Q2(a)(i) (1 mark): The size of the cell increases during stage G2 in the cell cycle. State one other process that takes place during stage G2. [1] 8 The length of a stag beetle la
- November 2021, Paper 3, Q2(b)(i) (1 mark): In one tissue, the scientists found a genetic mutation that stopped the metaphase checkpoint from working. Suggest an abnormality the scientists might observe i
- November 2021, Paper 3, Q2(b)(ii) (1 mark): In the other tissue, the scientists observed cells with chromosomes that had been replicated despite containing damaged DNA. Suggest which cell cycle checkpoint
- November 2021, AS Paper 1, Q22(b)(ii) (2 marks): A transmission electron microscope image of a white blood cell was studied. It was concluded that the cell had stopped dividing at the G2 checkpoint. Suggest tw
- November 2020, AS Paper 1, Q1 (1 mark): Which of the following stages, A to D, of the cell cycle, would DNA polymerase be most active? A G1 B G2 C mitosis D S Your answer [1]
- June 2019, AS Paper 1, Q20 (1 mark): The table below shows the stages of the cell cycle. Which row, A to D, shows the correct order of the different stages? Cytokinesis G1 G2 Mitosis S A four two t
- June 2018, Paper 2, Q10 (1 mark): During which stage of the cell cycle does semi-conservative DNA replication take place? A first growth phase B prophase C second growth phase D synthesis phase
- June 2018, Paper 2, Q11 (1 mark): The cell cycle includes a number of checkpoints. Which of the following statements about the cell cycle is correct? A If damaged DNA is detected at a checkpoint
- June 2018, AS Paper 1, Q20 (1 mark): In human cells, the tumour suppressor gene TP53 codes for a protein that interrupts the cell cycle if there is any damage to the DNA and prevents the copying of
- June 2016, AS Paper 2, Q2(b)(i) (1 mark): State all the letters in Fig. 2.3 that represent the phases of interphase. [1]
- June 2016, AS Paper 2, Q2(b)(ii) (1 mark): Suggest what is being checked at checkpoint Y on Fig. 2.3. [1]
- June 2016, AS Paper 2, Q2(c)(i) (1 mark): Which of the cells P, Q or R takes the shortest time to divide? [1]
- June 2016, AS Paper 2, Q2(c)(ii) (1 mark): Suggest why cell P spends twice as much time in phase S than cell Q. [1]
- June 2016, AS Paper 2, Q2(c)(iii) (2 marks): What can be deduced about the behaviour of cell R? Give reasons for your answer. [2]
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